Generic fault codes
9415 Generic OBD-II fault codes: what each one means, 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.
- P0157Generic · PowertrainO2 Sensor Circuit Low Voltage Bank 2 Sensor 2
- P0158Generic · PowertrainO2 Sensor Circuit High Voltage Bank 2 Sensor 2
- P0159Generic · PowertrainO2 Sensor Circuit Slow Response Bank 2 Sensor 2
- P015AGeneric · PowertrainO2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1
- P015BGeneric · PowertrainO2 Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1
- P015CGeneric · PowertrainO2 Sensor Delayed Response - Rich to Lean Bank 2 Sensor 1
- P015DGeneric · PowertrainO2 Sensor Delayed Response - Lean to Rich Bank 2 Sensor 1
- P015EGeneric · PowertrainExcessive Time to Enter Closed Loop Fuel Timing Control
- P015FGeneric · PowertrainExcessive Time to Enter Closed Loop Cylinder Balance Control
- P0160Generic · PowertrainO2 Sensor Circuit No Activity Detected Bank 2 Sensor 2
- P0161Generic · PowertrainO2 Sensor Heater Circuit Bank 2 Sensor 2
- P0162Generic · PowertrainO2 Sensor Circuit Bank 2 Sensor 3
- P0163Generic · PowertrainO2 Sensor Circuit Low Voltage Bank 2 Sensor 3
- P0164Generic · PowertrainO2 Sensor Circuit High Voltage Bank 2 Sensor 3
- P0165Generic · PowertrainO2 Sensor Circuit Slow Response Bank 2 Sensor 3
- P0166Generic · PowertrainO2 Sensor Circuit No Activity Detected Bank 2 Sensor 3
- P0167Generic · PowertrainO2 Sensor Heater Circuit Bank 2 Sensor 3
- P0168Generic · PowertrainFuel Temperature Too High
- P0169Generic · PowertrainIncorrect Fuel Composition
- P016AGeneric · PowertrainExcessive Time To Enter Closed Loop Air/Fuel Ratio Control
- P016BGeneric · PowertrainClosed Loop Air/Fuel Ratio Control At Limit - System Too Rich
- P016CGeneric · PowertrainClosed Loop Air/Fuel Ratio Control At Limit - System Too Lean
- P016DGeneric · PowertrainExcessive Time To Enter Closed Loop Fuel Pressure Control
- P016EGeneric · PowertrainClosed Loop Fuel Pressure Control At Limit - Pressure Too High
- P016FGeneric · PowertrainClosed Loop Fuel Pressure Control At Limit - Pressure Too Low
- P0170Generic · PowertrainFuel Trim Bank 1
- P0171Generic · PowertrainSystem Too Lean Bank 1
- P0172Generic · PowertrainSystem Too Rich Bank 1
- P0173Generic · PowertrainFuel Trim Bank 2
- P0174Generic · PowertrainSystem Too Lean Bank 2