How to Read Stored Codes on Obd Scanner

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Got your car diagnosed, found an OBD2 lawmaking, at present want to know what it is?

Don't worry! All car diagnostic codes are here for you to discover.

In this commodity, you lot'll find what any OBD2 code means, the causes, symptoms, and how to prepare it. We also offer code lists in PDF for free download.

Permit'south get!!

All OBD2 Codes Lookup

Search below all generic and manufacturer-specific OBD2 mistake codes and their meaning in nigh of the pop automobile makes such equally Acura, Audi, BMW, Chevrolet, Dodge, Chrysler, Jeep, Ford, Honda, Hyundai, Infiniti, Isuzu, Jaguar, KIA, Land Rover, Lexus, Mazda, Mitsubishi, Nissan, Subaru, Toyota, and VW, etc.

What is an OBD2 Code?

obd2 codes samples — Samples of OBD2 Codes detected with OBD Auto Medico software

OBD is brusk for onboard diagnostics. Information technology refers to a vehicle's electronic system that performs cocky-diagnosis and reporting. Whenever a trouble is detected, the system records it as a unique code. That code is known as a diagnostic trouble code (DTC). As a vehicle owner or mechanic, you can pull that lawmaking and interpret it to understand the nature of the problem. For example, if the auto gives you the P0201 code, information technology means that at that place's a malfunction in cylinder 1 of the injector circuit. Your chore is to pinpoint the issue and set up it.

Now, with that in mind, OBDII codes are trouble codes specific to OBD2 vehicles. These are mostly cars, SUVs, lite trucks, etc., made/sold in the US since 1996. In other words, if an auto is a 1996 or newer model, it is OBD2-compliant. And that as well means that information technology uses OBD-II codes to do self-diagnosis and reporting. I'll be using all iii interchangeably all through the post, be certain not to get confused.

How to Read OBD2 Codes

OBD provides monitoring for various systems. They include the engine control module, body, chassis, etc. When you await at an OBD2 lawmaking, you can immediately tell where the fault is by reading the letters and numbers it contains. Below is a breakdown.

Explanation of OBD2 codes — How to read OBD2 code by reading the letters and numbers it contains

The First Character (Letter)

All OBDII codes commencement with a alphabetic character that denotes the part of the vehicle that has a error. Let's check it out, shall we?

P – Powertrain. It includes the engine, manual, and all the associated accessories.

U – Network & Vehicle Integration. These are functions that are managed and shared by onboard computer systems.

B – Torso. These are parts mainly found in the passenger compartment expanse.

C – Chassis. It covers mechanical systems and functions like steering, suspension, and braking.

The Second Character (Number)

A number usually follows the first letter. This number can merely exist '0', '1', '2', or '3'.

0 – If it's a '0', '2', or 'three', the code is a standardized (SAE) code; as well known as generic lawmaking

one – If it'south a 'i', yous're looking at a manufacturer-specific code

The 3rd Character (Number/Letter)

This number denotes the detail vehicle system that has a fault. There are 8 systems in total:

0 – Fuel and air metering and auxiliary emission controls

one – Fuel and air metering

2 – Fuel and air metering (injector circuit)

3 – Ignition systems or misfires

four – Auxiliary emission controls

5 – Vehicle speed command and idle command systems

six – Computer and output circuit

7 – Transmission

A-F – Hybrid Problem Codes

The Fourth And Fifth Characters (Number)

The final piece of a DTC is a two-digit number. This number defines the exact problem that you're dealing with. It can be any number between 0 and 99.

As you can run into, a typical DTC has 5 characters in total, and each i of those characters gives it a description. For example, if yous get the code P0219, it means that the car has an engine over-speed condition.

The 'P' means that the problem is in the powertrain. The '0' means that it's a generic code, while the 'ii' refers to the fuel and air metering (injector circuit) arrangement. The last two digits (19) define the problem, i.e., an over-speed condition.

Want to know more about codes and their meanings? Below is a more comprehensive OBD codes listing.As mentioned already, DTC codes that commencement with 'P' relate to the powertrain. Those that brainstorm with 'U' are for the network and vehicle integration system. The letter 'B' refers to the vehicle's body, while 'C' is for the chassis.

Bonus: Best Professional OBD2 Scanners for DIY 2021

Meaning and Fix guide of OBD2 codes — DTC codes that get-go with 'P' chronicle to the powertrain. Those that begin with 'U' are for the network and vehicle integration system. The letter 'B' refers to the vehicle'south body while 'C' is for the chassis.

OBD2 Codes List PDF for Complimentary Download

Generic Powertrain OBD2 Trouble Codes List PDF

P0001 through P0099
P0100 through P0199
P0200 through P0299
P0300 through P0399

P0400 through P0499
P0500 through P0599
P0600 through P0699
P0700 through P0799

P0800 through P0899
P0900 through P0999
P0A00 through P0AFF
P0B00 through P0BFF

P0C00 through P0F00
P2000 through P2099
P2100 through P2199
P2200 through P2299

P2300 through P2399
P2400 through P2499
P2500 through P2599
P2600 through P26A2

P2700 through P2799
P2800 through P2899
P2A00 through P2F00
P3000 through P3F00

Generic Chassis, Network, and Trunk Codes [PDF]

Total B code list (B0001 through B3000)
Full C code list (C0001 through C2000)
Total U code list (U0001 through U3000)

Manufacturer-Specific OBD2 Codes [PDF]

To download your vehicle OBD2 code listing, click the link you lot desire:

Acura codes
Audi codes
BMW codes

Chevrolet codes
Dodge/Chrysler/Jeep codes
Ford Codes

Honda Acura Codes
Hyundai Codes
Infiniti Codes

Isuzu Codes
Jaguar Codes
KIA Codes
GM Codes

Land Rover Codes
Lexus Codes
Mazda Codes
Mitsubishi Codes

Nissan Codes
Subaru Codes
Toyota Codes
VW Codes

Dodge Jeep Chrysler OBD1 and OBD2 Codes
Ford OBD1 and OBD2 Codes
GM OBD1 and OBD2 Codes
Honda Acura OBD1 and OBD2 Codes

OBD2 Codes

Below are the details of the top popular OBDII codes with significant, causes, and fixes.

P0010 Intake Camshaft Position Actuator Circuit / Open up (Banking concern i)

The P0010 code happens when the 'bank i' camshaft and the crankshaft have a mechanical timing variation. The problem occurs when the engine experiences high RPM. The ECM doesn't correctly adjust valve lift at high RPM.

Main Symptoms:

Bank check Engine Light comes on
The engine performs poorly at high RPM
Motorcar runs roughly
Lower fuel economy
Car fails the emission test

Possible Causes:

Sludge in engine oil
Faulty OVC (oil command valve)
Internal damage to ECM
ECM timing is out of sync
Wiring damage
Malfunction of crankshaft or camshaft sensor
A short in VCT/VVT circuit or the circuit is open

Diagnostic Steps:

Use an advanced diagnostic tool to pull engine codes
Inspect the VVT/VCT solenoid system for dingy oil
Audit the circuit for wiring problems

P0011 Intake Camshaft Position Timing – Over-Avant-garde (Bank 1)

The P0011 code is triggered when the camshaft timing for bank 1 is higher up the limit set by the ECM. This situation causes an over-advanced status that occurs either during retarding or advancing the camshaft timing.

Primary Symptoms:

Check Engine Calorie-free comes on
Hard starting
Poor idle
Car may run rough or stall
Poor fuel economy
Automobile may fail an emission test

Possible Causes:

Camshaft remains advanced despite ECM commanding information technology to retard
Banking concern ane oil control solenoid may be chock-full or stuck
Oil may be too thick and is thus blocking passages in bank one
Wiring problems in VCT/VVT
Oil continuously flows to VCT piston chambers open up

Diagnostic Steps:

Check that engine oil is clean and has the recommended viscosity
Visually inspect the wiring in the CVT organisation
Pull engine codes and live data using an advanced diagnostic tool

P0012 Intake Camshaft Position Timing – Over-Retarded (Banking company 1)

The P0012 code is triggered when bank 1 has an over-retarded timing condition that occurs either during retarding or advancing.

Principal Symptoms:

Cheque Engine Light comes on
Difficult starting
Poor fuel economy
Automobile may run rough or stall
Auto may fail an emission test

Possible Causes:

Camshaft timing is incorrect
Wiring problems in VCT/VVT
Oil continuously flows to the VCT piston bedchamber
Timing valve solenoid command has failed and is stuck in the open position
Oil may be too thick and is thus blocking passages in bank 1

Diagnostic Steps:

Cheque that engine oil is clean
Visually inspect the wiring in the CVT organization
Pull engine codes and live information using an advanced diagnostic tool
Using the bidirectional scanner, command the timing valve solenoid control valve to open up and close, then see if camshaft timings alter. If they alter, information technology ways the valve is not the problem

P0014 Exhaust Camshaft Position Timing – Over-Avant-garde (Bank 1)

The P0014 lawmaking happens when bank one camshaft has an over-advanced timing condition that occurs either during retarding or advancing.

Chief Symptoms:

Check Engine Light comes on
Hard starting
Poor fuel economy
Car may run rough or stall
Car may fail emission test

Possible Causes:

Camshaft timing is incorrect
Wiring problems in VCT/VVT
Oil continuously flows to the VCT piston sleeping room
Timing valve solenoid control has failed and is stuck in the open position
Oil may be too thick and is thus blocking passages in banking concern 1

Diagnostic Steps:

Check that engine oil is clean and full in the tank
Visually inspect the wiring in the CVT arrangement
Pull engine codes and live data using the advanced diagnostic tool

Using the bidirectional scanner, control the timing valve solenoid control valve to open and close, so run across if camshaft timings change. If they change, it means the valve is not the problem

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P0016 Crankshaft Position Camshaft Position Correlation Bank ane Sensor A

The P0016 code occurs when the crankshaft and camshaft signals are out of fourth dimension. Significant the ECM can detect that the crankshaft's timing and that of the camshaft do not correlate.

Master Symptoms:

Check Engine Light comes on
The engine may creepo simply fail to showtime
The engine may go on to run simply will record poor performance
Rattling sound in the harmonic balancer
Poor fuel economy

Possible Causes:

The timing chain is overstretched
Tone band on the camshaft and/or crankshaft is has slipped or broken
Timing chain has jumped teeth and put camshaft timing out of position
Problems with camshaft phaser and putting the phaser out of position
Wiring to crank/cam sensor is damaged

Diagnostic Steps:

Inspect oil control valve (OCV) for connection or wiring problems
Check that engine oil is clean, full, and has the right viscosity
Pull engine codes and alive data using an avant-garde diagnostic tool
Using the bidirectional scanner, command the OVC on and off, then see if camshaft timings modify. If they modify, it ways the valve is non the trouble

P0037 Heated Oxygen Sensor (H02S) Heater Control Circuit Bank 1 Sensor 2

The P0037 code is triggered when bank ane, sensor two of the O2 sensor heater circuit is faulty. For case, the engine isn't achieving a closed-loop and causes the automobile to increase emissions.

Main Symptoms:

Check Engine Light comes on
Longer fourth dimension needed to reach a closed-loop
Decreased fuel economy
The engine may get into the fixed fuel mix

Possible Causes:

H02S sensor in banking company one, circuit two is non sending the correct bespeak to ECM
Damaged or failed element in the heater circuit
Open in O2 sensor heater'due south excursion
Open/brusk in O2 sensor heater'south battery
Lacking ECM (this is the least likely cause)

Diagnostic Steps:

Inspect wiring and ability to the O2 sensor and ensure there's no damage/open up/short
Use code reader to pull engine codes
Check the voltage of the O2 sensor and ensure it matches the manufacturer's specs
Replace O2 sensor if necessary

P0102 Mass or Volume Air Flow Excursion low Input

The P0102 lawmaking happens when the mass airflow (MAF) sensor does not perform inside the standard expectation and sends a lower signal than usual (due to low voltage).

Primary Symptoms:

Bank check Engine Light comes on
Extremely low fuel consumption and thus internal engine problems
Engine runs roughly
Motorcar idles and stalls frequently

Possible Causes:

Defective MAF sensor
Presence of dirt and droppings in MAF (restricts airflow)
Leaks in the air intake system
Improper wiring of the circuit to MAF sensor

Diagnostic Steps:

Apply code reader to pull engine codes
Visually inspect MAF sensor wiring and circuit
Check for air leaks in the air intake system
Inspect MAF to encounter if in that location are clay and debris

P0106 Manifold Absolute Pressure level/Barometric Force per unit area Circuit Range/Performance Problem

The P0106 code is triggered when the Powertrain Control Module (PCM) has non detected a modify in engine speed, throttle bending, and exhaust gas recirculation (EGR) despite an increase in manifold absolute force per unit area (MAP). An increase in MAP indicates an increase in engine load.

Main Symptoms:

Check Engine Lite comes on
Poor fuel economic system
Engine fails to idle
The engine produces black fume (visible at tailpipe)
Erratic acceleration

Possible Causes:

Faulty MAP sensor
The air intake component is loose, cracked, or doesn't have its plastic fitting
Water or dirt affecting connector to MAP sensor
Corrosion may be causing the poor betoken to and from the MAP sensor
PCM is defective (least likely merely not unlikely)

Diagnostic Steps:

Utilise an advanced scanner to pull engine codes.
With that scanner, diagnose the MAP sensor when the engine is off and the fundamental is on. It should be similar or close to barometric pressure (BARO) reading.
Start the engine and see if MAP sensor readings drop significantly. If they do, the sensor is working correctly.

Read more than

P0113 Intake Air Temperature Excursion High Input (Sensor one)

P0113 means that the signal voltage from the intake air temperature (IAT) is above 5V, which is more than the expected range.

Primary Symptoms:

Check Engine Light comes on
The engine may run extra lean

Possible Causes:

Lacking IAT sensor
Loose or faulty wiring at IAT sensor
Open or short in IAT ground excursion, signal circuit, or reference circuit
PCM is defective (least likely just not unlikely)

Diagnostic Steps:

Apply an advanced scanner to pull engine codes.
View live data from the IAT sensor. If the result is less than -30 degrees Celsius, then the sensor is probable to be faulty. Otherwise, it's probably an intermittent trouble.
Check the wiring for opens and loose connections.

P0118 Engine Coolant Temperature Circuit High Input

P0118 means that the PCM has determined that ECT is less than freezing temp, nevertheless the engine has been running for several minutes, which shouldn't happen.

Main Symptoms:

Check Engine Light comes on
Poor fuel economy
The engine fails to idle and may non showtime completely
The engine produces black smoke (visible at tailpipe)

Possible Causes:

Defective ECT sensor
Open or short in ECT bespeak or ground circuit
PCM is defective (least probable but not unlikely)

Diagnostic Steps:

Using an OBD2 scanner, check the ECT. If it'due south a logical reading, the problem is intermittent.
Perform a wiggle test while looking out for drop-outs. If there are any, at that place's a bad connection to or from the ECT sensor.

P0121 Throttle/Pedal Position Sensor/Switch A Excursion Range/Functioning Problem

P0121 happens when the PCM has detected that the throttle position sensor (TPS) voltage is more or less than it should exist for the current RPM.

Main Symptoms:

Check Engine Calorie-free comes on
The car produces blackness fume (visible at tailpipe)
Car stumbles when you accelerate or decelerate
The engine may fail to first completely

Possible Causes:

Defective TPS
Open or short in TPS excursion
Loose or bad connection to TPS
PCM is defective (least likely only not unlikely)

Diagnostic Steps:

Visually audit all wiring to TPS for loose, open, or brusk connections

Using an OBD2 scanner, check for live data and freeze-frame data from TPS. If it doesn't read 0.five at idle and 4.5 at total throttle, the TPS is faulty

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P0122 Throttle/Pedal Position Sensor/Switch A Circuit Depression Input

P0122 means that the PCM reports that the TPS has recorded a lower voltage than the minimum limit. The value varies from one car to another, only the code may come up when the voltage hits 0.20V or less.

Main Symptoms:

Bank check Engine Light comes on
Extremely high idle
Crude or low idle
Car stalls
Acceleration is depression or completely lacking

Possible Causes:

Defective TPS
Open or brusk in TPS circuit
Improper mounting of TPS later on replacement
TPS has loosened
PCM is defective (least likely only not unlikely)

Diagnostic Steps:

Visually inspect all wiring to TPS for loose, open up, or poor connections.
Check that TPS is tightly in position, peculiarly if you recently replaced it.

P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

P0128 OBD2 code means the PCM has detected that the engine has not attained the required temperature despite it is on for enough time to reach that temperature.

Main Symptoms:

Check Engine Light MAY come on
Engine temp drops when the vehicle is in loftier speed
Engine takes abnormally long to warm

Possible Causes:

Most likely cause is that thermostat is leaking or stuck in open up position
Engine coolant level is too depression
Defective IAT sensor
Lacking ECT sensor
Defective cooling fan

Diagnostic Steps:

Bank check whether coolant forcefulness and level are in the recommended range
Check whether IAT sensor, ECT sensor and coolant fan are working
If all the above are okay then the thermostat is the problem

P0131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

P0131 triggers when the ECM has adamant a low voltage status in bank 1 sensor ane; i.east., O2 sensor voltage remained too low for longer than 2 minutes.

Principal Symptoms:

Check Engine Light comes on
The auto produces black smoke (visible at tailpipe)
Poor fuel economic system
The engine may fail to start completely
If it starts, it may run rough and/or stumble

Possible Causes:

More often than not a problem related to corrosion, loose terminal, or burnt wire in the O2 sensor 1 connector
Lacking O2 sensor
Open or short in the wiring to the O2 sensor
O2 circuit is experiencing high resistance

Diagnostic Steps:

Visually inspect all wiring to O2 sensor 1 for loose, open up, or brusk connections
Use a wiggle test to make up one's mind where the voltage drops out
Using an OBD2 scanner, bank check whether sensor one of bank one is switching properly

P0133 O2 Sensor Excursion Slow Response (Bank 1 Sensor ane)

P0133 occurs when the O2 sensor or ECM can't adjust the air to fuel ratio as it'due south supposed to fifty-fifty when the engine is running.

Chief Symptoms:

Generally doesn't come with symptoms. However, in some cases, the Check Engine Low-cal may come on, and fuel economy may reduce

Possible Causes:

The first O2 sensor in bank 1 is faulty
Short, open, or broken wire in the O2 sensor circuit
Exhaust leak

Diagnostic Steps:

Visually audit all wiring to the first O2 sensor for loose, open, or short connections
• Utilize a wiggle test to make up one's mind where the voltage drops out
• Visually check for exhaust leaks or air inlet leaks
• Using an OBD2 scanner, check whether sensor one of banking concern 1 is switching properly

P0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

Usually, when the O2 heater attains operating temperature, the O2 sensor switches based on ambient temp. If ECM determines that the O2 sensor took too long to switch, this code is set. It applies to the showtime sensor of bank i

Master Symptoms:

Check Engine Light comes on
Poor fuel economy

Possible Causes:

Short, open up, or broken wire in O2 heating system
High resistance in O2 heater element or excursion

Diagnostic Steps:

Visually inspect all wiring to the offset O2 sensor (banking company ane) for loose, open up, or short connections
Utilise a jerk test to determine where the voltage drops out
If the lawmaking is persistent, replace the O2 sensor

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P0136 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)

P0136 ways that the ECM has adamant a low voltage condition in bank 1 sensor 2; i.eastward., O2 sensor voltage remained too low for longer than 2 minutes.

Main Symptoms:

Check Engine Calorie-free comes on
The automobile produces black smoke (visible at tailpipe)
Poor fuel economy
The engine may neglect to start completely
If it starts, information technology may run rough and/or stumble

Possible Causes:

Mostly a problem related to corrosion, loose terminal, or burnt wire in the O2 sensor two connector
Defective O2 sensor
Open or brusque in the wiring to the O2 sensor
O2 circuit is experiencing high resistance

Diagnostic Steps:

Visually audit all wiring to O2 sensor ii for loose, open, or curt connections
Employ a wiggle examination to determine where the voltage drops out
Using an OBD2 scanner, check whether sensor 2 of bank 1 is switching properly

P0137 O2 Sensor Excursion Low Voltage (Depository financial institution 1 Sensor 2)

Basically the same as P0136. The P0137 is triggered when the PCM has detected that the O2 sensor may be inactive.

Main Symptoms:

Generally doesn't come with symptoms. However, in some cases, the Check Engine Low-cal may come on, and fuel economy may reduce

Possible Causes:

Faulty O2 sensor
Curt, open up, or broken wire in the O2 sensor circuit
Lacking heater circuit in the O2 sensor
High resistance in O2 heater element or circuit
Faulty fuel pump regulator resulting in very high or very low fuel pressure
Frazzle leak

Diagnostic Steps:

Visually inspect all wiring to O2 sensor for loose, open up, or short connections
Utilize a wiggle test to decide where the voltage drops out
Visually check for frazzle leaks or air inlet leaks
If the lawmaking is persistent, replace the O2 sensor

P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)

The P0138 code means the heated O2 sensor in banking company 1 sensor 2 gives a higher voltage reading than it should. For most vehicles, the code comes when voltage exceeds 1.5V.

Main Symptoms:

Generally doesn't come with symptoms. However, in some cases, the Check Engine Light may come up on, and fuel economic system may reduce

Possible Causes:

Fuel temp is excessively high
Short, open, or broken wire in the O2 sensor circuit

Diagnostic Steps:

Visually inspect all wiring to O2 sensor for loose, open, or brusk connections
Use a wiggle exam to decide where the voltage drops out
Using an OBD2 scanner, cheque whether sensor 1 of bank ii is switching properly

P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor two)

P0141 means when the O2 heater attains operating temperature, the O2 sensor switches based on ambient temp. If ECM determines that the O2 sensor took too long to switch, this code is prepare. It applies to the second sensor of bank 1.

Master Symptoms:

Check Engine Light comes on
Poor fuel economy

Possible Causes:

Brusk, open up, or cleaved wire in O2 heating system
Loftier resistance in O2 heater element or circuit

Diagnostic Steps:

Visually inspect all wiring to the second O2 sensor (banking concern 1) for loose, open up, or brusque connections
Use a wiggle test to determine where the voltage drops out
If the lawmaking is persistent, supersede the O2 sensor

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P0161 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)

P0161 triggers when the O2 heater attains operating temperature, O2 sensor switches based on ambient temp. If ECM determines that the O2 sensor took also long to switch, this lawmaking is set. It applies to the second sensor of bank 2.

Main Symptoms:

Check Engine Light comes on
Poor fuel economy

Possible Causes:

Short, open, or broken wire in O2 heating organisation
Loftier resistance in O2 heater chemical element or circuit

Diagnostic Steps:

Visually inspect all wiring to the second O2 sensor (bank ii) for loose, open up, or short connections
Use a wiggle test to determine where the voltage drops out
If the code is persistent, replace the O2 sensor

P0171 System Too Lean (Bank 1)

P0171 indicates that in that location is a lean condition in bank 1; i.eastward., there's excess oxygen in the frazzle

Principal Symptoms:

Significant subtract in engine power
Machine hesitates so surges upon acceleration
Rough idle

Possible Causes:

Muddied or defective MAF sensor
MAF sensor has a vacuum leak
Positive Crankcase Ventilation (PCV) valve is stuck in the open position
Leak either in PCV or vacuum organization

Diagnostic Steps:

Inspect MAF sensor in bank 1 for dirt and droppings
Check whether fuel pressure is correct
Cheque vacuum and PCV for leaks
Run a smog exam using an OBD2 scanner

P0172 Organisation Too Rich (Depository financial institution 1)

P0172 happens when there's a rich condition in bank 1; i.due east., in that location's too petty oxygen in the frazzle condition in bank 1; i.e., at that place's excess oxygen in the frazzle.

Primary Symptoms:

Generally doesn't come up with symptoms, but the Check Engine Calorie-free may come on, and the engine may misfire

Possible Causes:

Dirty or lacking MAF sensor
MAF sensor has a vacuum leak
The trouble relating to fuel pressure or delivery

Diagnostic Steps:

Inspect MAF sensor in bank ane for dirt and debris
Cheque whether fuel pressure is correct
Inspect fuel lines and injectors for any leaks/openings and dirt
Bank check vacuum, PCV, and exhaust for leaks
Run a smog test using an OBD2 scanner

P0174 Organization Too Lean (Bank ii)

This code ways that there's a lean condition in banking company ii; i.due east., at that place's backlog oxygen in the exhaust

Principal Symptoms:

Significant decrease in engine power
Machine hesitates so surges upon acceleration
Crude idle

Possible Causes:

Muddied or defective MAF sensor
MAF sensor has a vacuum leak
Positive Crankcase Ventilation (PCV) valve is stuck in the open up position
Leak either in PCV or vacuum organization

Diagnostic Steps:

Inspect MAF sensor in bank ii for clay and debris
Bank check whether fuel pressure is correct
Bank check vacuum and PCV for leaks
Run a smog test using an OBD2 scanner

P0300 Random/Multiple Cylinder Misfire Detected

When the lawmaking P0300 is triggered, it means that PCM has detected that there's an engine cylinder that'south non firing properly. It could be one or more cylinders. PCM hasn't specified the verbal cylinder

Main Symptoms:

Bank check Engine Lite comes on
Bank check Engine Light may flash
Engine lacks power
The engine may be hard to start
The engine may stumble and hesitate frequently

Possible Causes:

Defective or worn out spark plugs
Depression fuel pressure
Vacuum leak
Defective catalytic converter
Defective fuel injector
Defective coil
Bad camshaft position sensor
Defective crankshaft sensor
Trouble with benefactor

Diagnostic Steps:

Using a browse tool, pull codes and see if at that place are any other besides P0300. Address the others get-go
Inspect whether there are loose, open, or short wires in ignition coils
Audit whether spark plugs and their wires are in good condition
Check that fuel pressure level is within the recommended range
Audit fuel injectors to see whether they are in skilful condition

P0301 Cylinder 1 Misfire Detected

The meaning of P0301 is that the PCM has detected that cylinder #ane is not firing properly.

Main Symptoms:

Bank check Engine Lite comes on
Check Engine Lite may wink
Engine lacks power
The engine may exist hard to start
The engine may stumble and hesitate frequently

Possible Causes:

Lacking or worn out spark plugs in cylinder i
Depression fuel force per unit area
Vacuum leak
Defective catalytic converter
Lacking fuel injector
Lacking ringlet
Defective camshaft position sensor
Defective crankshaft sensor
Problem with distributor

Diagnostic Steps:

Using a browse tool, pull codes and see if there are any other likewise P0301. Accost the others start
Inspect whether there are loose, open, or short wires in ignition coils in cylinder 1
Audit whether cylinder 1 spark plugs and their wires are in proficient status
Check that fuel pressure is within the recommended range
Inspect fuel injectors to come across whether they are in good condition

P0302 Cylinder 2 Misfire Detected

P0302 indicates that the PCM has detected that cylinder #two is not firing properly

Chief Symptoms:

Check Engine Light comes on
Check Engine Light may flash
Engine lacks ability
The engine may be difficult to first
The engine may stumble and hesitate often

Possible Causes:

Defective or worn out spark plugs in cylinder 2
Low fuel force per unit area
Vacuum leak
Defective catalytic converter
Lacking fuel injector
Defective ringlet
Lacking camshaft position sensor
Defective crankshaft sensor
Problem with distributor

Diagnostic Steps:

Using a scan tool, pull codes and see if there are any other besides P0302. Address the others first
Inspect whether in that location are loose, open, or brusque wires in ignition coils in cylinder 2
Inspect whether cylinder 2 spark plugs and their wires are in good condition
Check that fuel pressure is within the recommended range
Inspect fuel injectors to meet whether they are in good condition

P0303 Cylinder 3 Misfire Detected

The P0303 code occurs when the PCM has detected that cylinder #3 is non firing properly.

Main Symptoms:

Check Engine Light comes on
Check Engine Light may flash
Engine lacks ability
The engine may exist hard to start
The engine may stumble and hesitate frequently

Possible Causes:

Lacking or worn out spark plugs in cylinder 3
Depression fuel pressure level
Vacuum leak
Lacking catalytic converter
Defective fuel injector
Lacking coil
Defective camshaft position sensor
Defective crankshaft sensor
Problem with distributor

Diagnostic Steps:

Using a scan tool, pull codes and encounter if there are any other besides P0303. Address the others commencement
Inspect whether there are loose, open up, or short wires in ignition coils in cylinder 3
Inspect whether cylinder 3 spark plugs and their wires are in adept condition
Check that fuel pressure is inside the recommended range
Inspect fuel injectors to see whether they are in expert condition

P0304 Cylinder 4 Misfire Detected

The P0304 lawmaking is triggered when the PCM has detected that cylinder #4 is not firing properly.

Chief Symptoms:

Cheque Engine Light comes on
Cheque Engine Light may flash
Engine lacks power
The engine may be hard to showtime
The engine may stumble and hesitate frequently

Possible Causes:

Defective or worn out spark plugs in cylinder four
Low fuel pressure
Vacuum leak
Defective catalytic converter
Defective fuel injector
Defective curl
Defective camshaft position sensor
Lacking crankshaft sensor
Problem with distributor

Diagnostic Steps:

Using a scan tool, pull codes and come across if at that place are any other likewise P0304. Address the others first
Inspect whether there are loose, open, or short wires in ignition coils in cylinder 4
Audit whether cylinder 4 spark plugs and their wires are in practiced condition
Bank check that fuel pressure is within the recommended range
Inspect fuel injectors to run into whether they are in good condition

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P0305 Cylinder 5 Misfire Detected

The P0305 code indicates that the PCM has detected that cylinder #five is not firing properly.

Main Symptoms:

Check Engine Light comes on
Check Engine Light may flash
Engine lacks power
The engine may exist difficult to start
The engine may stumble and hesitate frequently

Possible Causes:

Defective or worn out spark plugs in cylinder five
Low fuel pressure
Vacuum leak
Defective catalytic converter
Defective fuel injector
Defective scroll
Defective camshaft position sensor
Lacking crankshaft sensor
Problem with benefactor

Diagnostic Steps:

Using a scan tool, pull codes and meet if there are any other too P0305. Address the others showtime
Inspect whether there are loose, open, or brusk wires in ignition coils in cylinder v
Audit whether cylinder v spark plugs and their wires are in good condition
Check that fuel pressure is within the recommended range
Audit fuel injectors to run across whether they are in good condition

P0306 Cylinder vi Misfire Detected

The P0306 code is triggered when the PCM has detected that cylinder #6 is not firing properly.

Main Symptoms:

Check Engine Calorie-free comes on
Bank check Engine Calorie-free may flash
Engine lacks power
The engine may be difficult to offset
The engine may stumble and hesitate frequently

Possible Causes:

Defective or worn out spark plugs in cylinder 6
Low fuel pressure
Vacuum leak
Defective catalytic converter
Defective fuel injector
Defective coil
Defective camshaft position sensor
Defective crankshaft sensor
Trouble with distributor

Diagnostic Steps:

Using a scan tool, pull codes and encounter if there are any other besides P0306. Address the others first
Audit whether at that place are loose, open up, or brusque wires in ignition coils in cylinder 6
Inspect whether cylinder 6 spark plugs and their wires are in good status
Bank check that fuel pressure is within the recommended range
Inspect fuel injectors to see whether they are in adept status

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P0316 Misfire Detected On Startup (First one thousand Revolutions)

The P0316 code occurs when the PCM has detected a misfire of less than 1,000 revolutions afterward startup.

Main Symptoms:

Check Engine Light comes on
Engine lacks power
Crude idle

Possible Causes:

Lacking or worn out spark plugs
No fuel
Low fuel pressure
Vacuum leak
Lacking catalytic converter
Defective fuel injector
Defective coil
Defective crankshaft sensor
Wiring fault in the crankshaft position sensor
Problem with PCM

Diagnostic Steps:

Pull all codes, then address other misfire codes get-go
Bank check all wiring and connectors in crankshaft and camshaft position sensors
Review freeze frame data to narrow downwards the problem further

P0325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Unmarried Sensor)

The P0325 lawmaking is triggered when the PCM has detected that the engine'southward knock sensor ane in-excursion bank one is non working properly.

Chief Symptoms:

Generally doesn't come up with symptoms, merely Check Engine Calorie-free may come on.
The engine may also lose power

Possible Causes:

The kickoff sensor in circuit depository financial institution 1 may be faulty
Open or short in the wiring to the sensor
Problem with engine coolant
The engine is excessively lean
PCM has failed (to the lowest degree likely)

Diagnostic Steps:

Visually inspect all wiring to knock sensor 1 in excursion banking company ane. Ensure there are no shorts or open wires
View coolant temp information to check for issues
If there are none, clear the lawmaking and test drive the car. If it comes back, the sensor is defective

P0335 Crankshaft Position Sensor A Circuit Malfunction

The P0335 code happens when the PCM has detected that the crankshaft position (CKP) sensor does not produce pulses or the pulses are not normal. It uses these pulses to determine the position of the crankshaft.

Main Symptoms:

Check Engine Lite comes on
The engine may neglect to kickoff
The vehicle may run rough

Possible Causes:

Defective CKP sensor
Open or short in CKP sensor wiring
The timing belt is broken
PCM has failed (least likely)

Diagnostic Steps:

Starting time by checking if there'south an RPM signal (using a scanner)
If it's not there, bank check all the wires and connectors to the sensor. Repair equally necessary
Check the sensor's resistance and compare information technology with the manufacturer's recommendation. If they don't match, replace the sensor

P0340 Camshaft Position Sensor Circuit Malfunction

This OBD2 lawmaking ways that there's a problem with the camshaft position sensor (CPS) excursion. As such, PCM can't perform ignition spark and fuel injector timing properly.

Primary Symptoms:

Cheque Engine Light comes on
The engine may neglect to beginning
The vehicle may run rough
Crude idle
Misfire

Possible Causes:

Lacking CPS
Open up or short in CPS wiring
Lacking CKP sensor
PCM has failed (least likely)

Diagnostic Steps:

Audit wiring to CPS and ensure at that place are no open or broken wires
Check CPS voltage if it's inside the manufacturer's specs. If it is not, supersede the sensor
Cheque CKP sensor too to determine whether it's the source of the problem

P0401 Exhaust Gas Recirculation Flow Insufficient Detected

This code indicates that the PCM has detected an insufficient amount of EGR.

Principal Symptoms: The most notable symptom is engine pinging when the vehicle is at high speed or under load

Possible Causes:

Defective differential pressure feedback EGR (DPFE) sensor
Lacking EGR valve
EGR valve tin't open because of lack of vacuum
Blockage in EGR tube

Diagnostic Steps:

Check the EGR valve and its tubing for deposits
Check DPFE sensor voltage to ensure its inside a specified range
If not, replace the sensor. If it is, replace the EGR valve

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P0420 Catalyst System Efficiency Below Threshold (Bank i)

P0420 ways the Catalytic converter is not working equally efficiently as it should, and the vehicle is therefore emitting more harmful substances.

Principal symptoms:

Check Engine Calorie-free comes on
Engine lacks power
Reduced fuel economy

Possible Causes:

Defective O2 sensor
Lacking engine coolant temp
Wiring to downstream O2 sensor is damaged or improperly done
Leaking fuel injector
Oil is contaminated
Using leaded fuel where unleaded fuel was required
Defective catalytic converter, exhaust pipe, muffler, or exhaust manifold

Diagnostic Steps:

Inspect frazzle system for damage and leaks.
Cheque the voltage of the downstream O2 sensor while the engine is running. If it's not steady (jumpy between .one and .nine V), the catalytic converter needs replacing.

Bonus: How to Test an O2 Sensor with a Scan Tool

P0440 Evaporative Emission Control System Malfunction

The code P0440 means a component in the EVAP organization is non working properly

Chief Symptoms: Check Engine Calorie-free may come on

Possible Causes:

The gas cap is non working or has not been installed properly
The canister is plugged and defective
Purge solenoid has failed

Diagnostic Steps:

Inspect gas cap to encounter if information technology's installed tightly
Check for disconnected or cracked EVAP hoses
Audit the charcoal canister and fuel tank for leaks and damages
Cheque that the purge valve (solenoid) has no leaks

P0441 Evaporative Emission Control Organisation Incorrect Purge flow

P0441 code is triggered when the PCM finds that there's no purge catamenia (i.e., purge control valve is still closed) despite commanding a purge

Main Symptoms:

Cheque Engine Calorie-free may come on
Rough or erratic idle

4. Possible Causes:

Loose or damaged EVAP hoses
Lacking purge valve
The gas cap is loose, missing, or damaged
The charcoal canister is damaged or defective

5. Diagnostic Steps:

Audit gas cap to meet if it's installed tightly
Check for asunder or cracked EVAP hoses
Inspect the charcoal canister and fuel tank for leaks and damages
Check that the purge valve (solenoid) has no leaks

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P0442 Evaporative Emission Control Arrangement Leak Detected (small leak)

The code P0442 indicates that the PCM has detected a very small vapor leak somewhere in the EVAP control system

Main Symptoms:

Check Engine Light may come up on
Reduced fuel economic system

Possible Causes:

Loose or damaged EVAP hoses
Defective purge valve
The gas cap is loose, missing, or damaged
The charcoal canister is leaking
The fuel tank is leaking

Diagnostic Steps:

Audit gas cap to see if it'south installed tightly
Check for disconnected or cracked EVAP hoses
Inspect the charcoal canister and fuel tank for leaks and damages
Check that the purge valve (solenoid) has no leaks
If the above doesn't narrow down the problem, perform a smoke test

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P0443 Evaporative Emission Control System Purge Control Valve circuit Malfunction

This code means that either there's an open in the purge control valve excursion or the circuit has an aberrant voltage (too loftier or too low)

Main Symptoms:

Bank check Engine Light may come up on
Car may have a lean status

Possible Causes:

Purge solenoid has short or open
Short or open somewhere in the wiring harness to purge valve
Driver circuit in PCM has an open or short
Water intrusion has caused the connector to interruption or vesture out

Diagnostic Steps:

Using a scan tool, command purge valve to open. Listen for a clicking sound (one or many times)
If it doesn't click, examine solenoid and connectors for breakages and signs of farthermost wearing out
Check all the circuits for wiring issues

P0446 Evaporative Emission Command System Vent Command Excursion Malfunction

The P0446 indicates that the PCM has detected an open or brusque in the EVAP control circuit or a curt to ground circuit

Main Symptoms:

Check Engine Low-cal comes on

Possible Causes:

Defective EVAP vent valve
Blockage in vent valve
The vent valve control circuit has an open up or short

Diagnostic Steps:

Examine all wiring to vent valve
If the in a higher place checks out, replace the vent valve

P0449 Evaporative Emission Control System Vent Valve/Solenoid Excursion Malfunction

This code happens when the PCM has detected a problem in the excursion that controls the EVAP system vent.

Main Symptoms:

Bank check Engine Lite comes on

Possible Causes:

Defective EVAP vent valve
Wiring issue in the EVAP vent valve
Circuit issue in the EVAP vent valve

Diagnostic Steps:

Bank check all wires leading to the vent valve for shorts and opens
Check fuses that power the vent solenoid (in case there are any)
Examine if the vent valve has cracks or openings
Using a bidirectional scanner, actuate the valve to run across if it'southward working

P0452 Evaporative Emission System Pressure Sensor/Switch Low

The P0452 code indicates that the PCM has detected that the fuel tank pressure is abnormally low.

Main Symptoms:

Check Engine Calorie-free comes on

Possible Causes:

Defective fuel tank force per unit area (FTP) sensor
Wiring trouble in the circuits that lead to FTP sensor
Broken or croaky vapor line (either to the tank or vacuum canister)
Loose gas cap leading to loss of vacuum
Leaking gasket in the fuel pump module

Diagnostic Steps:

Check vapor hoses for whatsoever breakages and opens
Since diagnosing this problem is extremely hard (due to the location of the FTP sensor), it's recommended that you get a professional to exercise the chore

P0455 Evaporative Emission Control System Leak Detected (large leak)

P0455 code means that PCM has detected a large vapor leak somewhere in the EVAP command organisation

Primary Symptoms:

Check Engine Light may come on
Reduced fuel economy

Possible Causes:

Loose or damaged EVAP hoses
The gas cap is loose, missing, or damaged
Non-compatible gas cap

Diagnostic Steps:

Inspect gas cap to meet if it's installed tightly
Cheque for asunder or cracked EVAP hoses
Inspect the charcoal canister and fuel tank for leaks and damages
If the above doesn't work, supersede the gas cap

P0456 Evaporative Emissions System – Small leak detected

P0456 code means the FTP sensor has detected a small leak in the EVAP system.

Main Symptoms: Cheque Engine Light comes on

Possible Causes:

Faulty gas cap
A leak in fuel tank hoses or EVAP hoses
A leak in the vent valve or purge valve
A leak in the EVAP canister

Diagnostic Steps:

Use a bidirectional tool to actuate the vent solenoid as you monitor the FTP sensor. Information technology will tell you if the organization is sealing properly or not
If information technology is, utilise a smoke exam to decide the leak

P0457 Evaporative Emission Command System (EVAP) Leak Detected

When there's a vacuum leak, and the EVAP organization can't draw fuel vapors into the system for efficient burning, the P0457 is triggered.

Main Symptoms:

Check Engine Light comes on
The aroma of fuel in the exhaust
Reduced fuel economy

Possible Causes:

Check Engine Light comes on
The smell of fuel in the frazzle
Reduced fuel economic system

Diagnostic Steps:

Inspect gas cap and check if its loose or has debris that'south preventing it from fitting tightly
Inspect vacuum hoses for cracks and breaks
Inspect charcoal canister for leaks

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P0463 Evaporative Emission Control Arrangement Force per unit area Sensor High Input

When the fuel level sensor bespeak is above 5 volts for a prolonged time, P0463 happens.

Master Symptoms:

Check Engine Light comes on
Fuel light may come up on and sound alert
Fluctuating fuel level gauge
Fuel level gauge may erroneously read empty or full

Possible Causes:

Defective fuel level sensor
Problem with fuel level sensor circuit
Defective instrument cluster
Damaged fuel tank

Diagnostic Steps:

Visually audit fuel tank for damage or leaks
Inspect wiring harness
Practice voltage exam on fuel level sensor excursion
If all those checkouts, you may have to supervene upon the fuel tank

P0507 Idle Command Organization RPM higher Than Expected

The PCM has detected that the engine idle speed is higher than the pre-programmed RPM (typically over 200 RPM)

Principal Symptoms:

Check Engine Light comes on

Possible Causes:

Vacuum leak
The defective positive crankcase ventilation valve
Leaking air intake
Problem with throttle torso
Defective EVAP system
Defective idle air controller (IAC) or a problem with the IAC circuit
Failed PCM

Diagnostic Steps:

Bank check for vacuum leaks, amercement, and restriction
Note that this code is advisory more than than annihilation, so look out for other codes that it comes with and address those first

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P0700 Transmission Control System Malfunction

If the transmission control module (TCM) detects a fault in the transmission system and sets a code, the code will be triggered.

Principal Symptoms:

Check Engine Light comes on
Transmission may exhibit bug

Possible Causes: Any transmission-related problem can trigger this code

Diagnostic Steps: This is but an informational lawmaking, and so pull all transmission codes, address them and do a test drive to fix this code

Decision

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Source: https://www.obdadvisor.com/most-popular-obd2-codes/