Fault codes, in plain words

Selected guides

• P0420ModerateCatalyst System Efficiency Below Threshold (Bank 1)Emissions / Exhaust
• P0300SeriousRandom/Multiple Cylinder Misfire DetectedIgnition / Engine
• P0171ModerateSystem Too Lean (Bank 1)Fuel / Air Metering
• P0455MinorEVAP System Large Leak DetectedEVAP (Fuel Vapor)
• P0301SeriousCylinder 1 Misfire DetectedIgnition / Engine
• P0442MinorEVAP System Small Leak DetectedEVAP (Fuel Vapor)

All codes

100 codes

• P0420ModerateCatalyst System Efficiency Below Threshold (Bank 1)Emissions / Exhaust
• P0300SeriousRandom/Multiple Cylinder Misfire DetectedIgnition / Engine
• P0171ModerateSystem Too Lean (Bank 1)Fuel / Air Metering
• P0455MinorEVAP System Large Leak DetectedEVAP (Fuel Vapor)
• P0301SeriousCylinder 1 Misfire DetectedIgnition / Engine
• P0442MinorEVAP System Small Leak DetectedEVAP (Fuel Vapor)
• P0128ModerateCoolant Temperature Below Thermostat Regulating TemperatureCooling
• P0430ModerateCatalyst System Efficiency Below Threshold (Bank 2)Emissions / Exhaust
• P0174ModerateSystem Too Lean (Bank 2)Fuel / Air Metering
• P0303SeriousCylinder 3 Misfire DetectedIgnition / Engine
• P0302SeriousCylinder 2 Misfire DetectedIgnition / Engine
• P0304SeriousCylinder 4 Misfire DetectedIgnition / Engine
• P0446MinorEVAP Vent Control Circuit MalfunctionEVAP (Fuel Vapor)
• P0456MinorEVAP System Very Small Leak DetectedEVAP (Fuel Vapor)
• P0101ModerateMass Air Flow (MAF) Sensor Range/PerformanceFuel / Air Metering
• P0135MinorO2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)Emissions / O2 Sensor
• P0457MinorEVAP Leak Detected (Fuel Cap Loose/Off)EVAP (Fuel Vapor)
• P0299SeriousTurbocharger/Supercharger Underboost ConditionTurbo / Boost
• P0011ModerateCamshaft Position 'A' Timing Over-Advanced (Bank 1)Engine / Valve Timing
• P2002SeriousDiesel Particulate Filter Efficiency Below Threshold (Bank 1)Diesel / DPF
• P0010ModerateCamshaft A actuator circuit fault (Bank 1)Engine / Valve Timing
• P0012SeriousCamshaft A timing over-retarded (Bank 1)Engine / Valve Timing
• P0013ModerateCamshaft B actuator circuit fault (Bank 1)Engine / Valve Timing
• P0014SeriousCamshaft B timing over-advanced or system performance (Bank 1)Engine / Valve Timing
• P0016SeriousCrankshaft/camshaft correlation fault (Bank 1 Sensor A)Engine / Valve Timing
• P0017SeriousCrankshaft/camshaft correlation fault (Bank 1 Sensor B)Engine / Valve Timing
• P0100ModerateMass or volume air flow circuit faultFuel / Air Metering
• P0102ModerateMass or volume air flow circuit low inputFuel / Air Metering
• P0103ModerateMass or volume air flow circuit high inputFuel / Air Metering
• P0105ModerateManifold absolute/barometric pressure circuit faultFuel / Air Metering
• P0106ModerateManifold absolute/barometric pressure range or performanceFuel / Air Metering
• P0107ModerateManifold absolute/barometric pressure circuit low inputFuel / Air Metering
• P0108ModerateManifold absolute/barometric pressure circuit high inputFuel / Air Metering
• P0110ModerateIntake air temperature sensor 1 circuit faultFuel / Air Metering
• P0111ModerateIntake air temperature sensor 1 range or performanceFuel / Air Metering
• P0112ModerateIntake air temperature sensor 1 circuit low inputFuel / Air Metering
• P0113ModerateIntake air temperature sensor 1 circuit high inputFuel / Air Metering
• P0115SeriousEngine coolant temperature circuit faultCooling
• P0116SeriousEngine coolant temperature range or performanceCooling
• P0117SeriousEngine coolant temperature circuit low inputCooling
• P0118SeriousEngine coolant temperature circuit high inputCooling
• P0121SeriousThrottle/pedal position sensor A range or performanceFuel / Air Metering
• P0122SeriousThrottle/pedal position sensor A circuit low inputFuel / Air Metering
• P0123SeriousThrottle/pedal position sensor A circuit high inputFuel / Air Metering
• P0130ModerateOxygen sensor circuit fault (Bank 1 Sensor 1)Emissions / O2 Sensor
• P0131ModerateOxygen sensor circuit low voltage (Bank 1 Sensor 1)Emissions / O2 Sensor
• P0132ModerateOxygen sensor circuit high voltage (Bank 1 Sensor 1)Emissions / O2 Sensor
• P0133ModerateOxygen sensor slow response (Bank 1 Sensor 1)Emissions / O2 Sensor
• P0134ModerateOxygen sensor no activity detected (Bank 1 Sensor 1)Emissions / O2 Sensor
• P0136ModerateOxygen sensor circuit fault (Bank 1 Sensor 2)Emissions / O2 Sensor
• P0137ModerateOxygen sensor circuit low voltage (Bank 1 Sensor 2)Emissions / O2 Sensor
• P0138ModerateOxygen sensor circuit high voltage (Bank 1 Sensor 2)Emissions / O2 Sensor
• P0139ModerateOxygen sensor slow response (Bank 1 Sensor 2)Emissions / O2 Sensor
• P0140ModerateOxygen sensor no activity detected (Bank 1 Sensor 2)Emissions / O2 Sensor
• P0141ModerateOxygen sensor heater circuit fault (Bank 1 Sensor 2)Emissions / O2 Sensor
• P0155ModerateOxygen sensor heater circuit fault (Bank 2 Sensor 1)Emissions / O2 Sensor
• P0161ModerateOxygen sensor heater circuit fault (Bank 2 Sensor 2)Emissions / O2 Sensor
• P0172ModerateSystem too rich (Bank 1)Fuel / Air Metering
• P0175ModerateSystem too rich (Bank 2)Fuel / Air Metering
• P0087SeriousFuel rail/system pressure too lowFuel / Air Metering
• P0088SeriousFuel Rail/System Pressure Too HighFuel / Air Metering
• P0191SeriousFuel Rail Pressure Sensor A Circuit Range/PerformanceFuel / Air Metering
• P0201SeriousCylinder 1 Injector Circuit/OpenFuel / Air Metering
• P0202SeriousCylinder 2 Injector Circuit/OpenFuel / Air Metering
• P0203SeriousCylinder 3 Injector Circuit/OpenFuel / Air Metering
• P0204SeriousCylinder 4 Injector Circuit/OpenFuel / Air Metering
• P0305SeriousCylinder 5 Misfire DetectedIgnition / Engine
• P0306SeriousCylinder 6 Misfire DetectedIgnition / Engine
• P0325ModerateKnock Sensor 1 Circuit, Bank 1 or Single SensorIgnition / Engine
• P0327ModerateKnock Sensor 1 Circuit Low, Bank 1 or Single SensorIgnition / Engine
• P0335SeriousCrankshaft Position Sensor A CircuitEngine / Valve Timing
• P0336SeriousCrankshaft Position Sensor A Circuit Range/PerformanceEngine / Valve Timing
• P0340SeriousCamshaft Position Sensor A Circuit, Bank 1 or Single SensorEngine / Valve Timing
• P0341SeriousCamshaft Position Sensor A Circuit Range/Performance, Bank 1 or Single SensorEngine / Valve Timing
• P0351SeriousIgnition Coil A Primary/Secondary CircuitIgnition / Engine
• P0352SeriousIgnition Coil B Primary/Secondary CircuitIgnition / Engine
• P0353SeriousIgnition Coil C Primary/Secondary CircuitIgnition / Engine
• P0354SeriousIgnition Coil D Primary/Secondary CircuitIgnition / Engine
• P0400ModerateExhaust Gas Recirculation Flow MalfunctionEmissions / Exhaust
• P0401ModerateExhaust Gas Recirculation Flow Insufficient DetectedEmissions / Exhaust
• P0402ModerateExhaust Gas Recirculation Flow Excessive DetectedEmissions / Exhaust
• P0403ModerateExhaust Gas Recirculation A Control CircuitEmissions / Exhaust
• P0440MinorEvaporative Emission Control System MalfunctionEVAP (Fuel Vapor)
• P0441MinorEvaporative Emission Control System Incorrect Purge FlowEVAP (Fuel Vapor)
• P0443MinorEvaporative Emission System Purge Control Valve A CircuitEVAP (Fuel Vapor)
• P0500SeriousVehicle Speed Sensor A MalfunctionTransmission
• P0505ModerateIdle Control System MalfunctionFuel / Air Metering
• P0507ModerateIdle Control System RPM Higher Than ExpectedFuel / Air Metering
• P0562SeriousSystem Voltage LowElectrical / Charging
• P0563SeriousSystem Voltage HighElectrical / Charging
• P0700SeriousTransmission Control System Malfunction Indicator RequestTransmission
• P0715SeriousInput/Turbine Speed Sensor A Circuit MalfunctionTransmission
• P0720SeriousOutput Speed Sensor Circuit MalfunctionTransmission
• P0730SeriousIncorrect Gear RatioTransmission
• P0741SeriousTorque Converter Clutch Performance or Stuck OffTransmission
• P0234SeriousTurbocharger/Supercharger A Overboost ConditionTurbo / Boost
• P0236ModerateTurbocharger/Supercharger Boost Sensor A Circuit Range/PerformanceTurbo / Boost
• P2463SeriousDiesel Particulate Filter Restriction - Soot AccumulationDiesel / DPF
• P2263SeriousTurbocharger/Supercharger Boost System PerformanceTurbo / Boost
• P0068SeriousMAP/MAF - Throttle Position CorrelationFuel / Air Metering