DTC codes
Look up an OBD-II fault code: what it means on every car or on your make, and how to track it down.
How to read a code
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 4
- AreaAuxiliary emission controls
- 20
- FaultThe specific fault in that area
Read the code
Note every stored and pending code your scanner shows, such as P0420.
Find it
Search by code or by words. For a manufacturer code (P1, B1, C1, U1) pick your make: its meaning differs by make.
Open the code
Its page explains the symptoms, likely causes, the checks to run and the fixes.
- P02E6Generic · PowertrainDiesel Intake Air Flow A Position Sensor Circuit
- P02E7Generic · PowertrainDiesel Intake Air Flow A Position Sensor Circuit Range/Performance
- P02E8Generic · PowertrainDiesel Intake Air Flow A Position Sensor Circuit Low
- P02E9Generic · PowertrainDiesel Intake Air Flow A Position Sensor Circuit High
- P02EAGeneric · PowertrainDiesel Intake Air Flow A Position Sensor Circuit Intermittent/Erratic
- P02EBGeneric · PowertrainDiesel Intake Air Flow A Control Motor Current Range/Performance
- P02ECGeneric · PowertrainDiesel Intake Air Flow A Control System - High Air Flow Detected
- P02EDGeneric · PowertrainDiesel Intake Air Flow A Control System - Low Air Flow Detected
- P02EEGeneric · PowertrainCylinder 1 Injector Circuit Range/Performance
- P02EFGeneric · PowertrainCylinder 2 Injector Circuit Range/Performance
- P02F0Generic · PowertrainCylinder 3 Injector Circuit Range/Performance
- P02F1Generic · PowertrainCylinder 4 Injector Circuit Range/Performance
- P02F2Generic · PowertrainCylinder 5 Injector Circuit Range/Performance
- P02F3Generic · PowertrainCylinder 6 Injector Circuit Range/Performance
- P02F4Generic · PowertrainCylinder 7 Injector Circuit Range/Performance
- P02F5Generic · PowertrainCylinder 8 Injector Circuit Range/Performance
- P02F6Generic · PowertrainCylinder 9 Injector Circuit Range/Performance
- P02F7Generic · PowertrainCylinder 10 Injector Circuit Range/Performance
- P02F8Generic · PowertrainCylinder 11 Injector Circuit Range/Performance
- P02F9Generic · PowertrainCylinder 12 Injector Circuit Range/Performance
- P02FAGeneric · PowertrainDiesel Intake Air Flow Position Sensor Minimum/Maximum Stop Performance
- P02FBGeneric · PowertrainCold Start Fuel Injection Control Circuit/Open
- P02FCGeneric · PowertrainCold Start Fuel Injection Control Circuit Low
- P02FDGeneric · PowertrainCold Start Fuel Injection Control Circuit High
- P02FEGeneric · PowertrainCold Start Fuel Injection Control Circuit Range/Performance
- P02FFGeneric · PowertrainPropulsion System Inactive Timer Performance
- P0300Generic · PowertrainRandom/Multiple Cylinder Misfire Detected
- P0300Audi · PowertrainWorn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable), Incorrect ignition timing, Vacuum leak(s), Low or weak fuel pressure, Improperly functioning EGR system, Defective Mass Air Flow Sensor, Defective Crankshaft and or Camshaft Sensor, Defective Throttle Position Sensor, Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems)
- P0301Generic · PowertrainCylinder 1 Misfire Detected
- P0301Audi · PowertrainWorn out spark plugs, ignition wires, coil(s), distributor cap and rotor (when applicable), Incorrect ignition timing, Vacuum leak(s), Low or weak fuel pressure, Improperly functioning EGR system, Defective Mass Air Flow Sensor, Defective Crankshaft and or Camshaft Sensor, Defective Throttle Position Sensor, Mechanical engine problems (i.e.—low compression, leaking head gasket(s), or valve problems)