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.
- P014BGeneric · PowertrainO2 Sensor Delayed Response - Lean to Rich Bank 2 Sensor 2
- P014CGeneric · PowertrainO2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 1
- P014DGeneric · PowertrainO2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 1
- P014EGeneric · PowertrainO2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 1
- P014FGeneric · PowertrainO2 Sensor Slow Response - Lean to Rich Bank 2 Sensor 1
- P0150Generic · PowertrainO2 Sensor Circuit Bank 2 Sensor 1
- P0151Generic · PowertrainO2 Sensor Circuit Low Voltage Bank 2 Sensor 1
- P0152Generic · PowertrainO2 Sensor Circuit High Voltage Bank 2 Sensor 1
- P0153Generic · PowertrainO2 Sensor Circuit Slow Response Bank 2 Sensor 1
- P0154Generic · PowertrainO2 Sensor Circuit No Activity Detected Bank 2 Sensor 1
- P0155Generic · PowertrainO2 Sensor Heater Circuit Bank 2 Sensor 1
- P0156Generic · PowertrainO2 Sensor Circuit Bank 2 Sensor 2
- 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