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.
- P1083BMW · PowertrainFuel Control Mixture Lean Bank 1 Sensor 1
- P1084BMW · PowertrainFuel Control Mixture Rich Bank 1 Sensor 1
- P1085BMW · PowertrainFuel Control Mixture Lean Bank 2 Sensor 1
- P1086BMW · PowertrainFuel Control Mixture Rich Bank 2 Sensor 1
- P1087BMW · PowertrainO2 Sensor Circuit Slow Response in Lean Control Range Bank 1 Sensor 1
- P1088BMW · PowertrainO2 Sensor Circuit Slow Response in Rich Control Range Bank 1 Sensor 1
- P1089BMW · PowertrainO2 Sensor Circuit Slow Response in Lean Control Range Bank 1 Sensor 2
- P1090BMW · PowertrainPre-Catalyst Fuel Trim Too Lean Bank 1
- P1091BMW · PowertrainPre-Catalyst Fuel Trim Too Rich Bank 1
- P1092BMW · PowertrainPre-Catalyst Fuel Trim Too Lean Bank 2
- P1093BMW · PowertrainPre-Catalyst Fuel Trim Too Rich Bank 2
- P1094BMW · PowertrainO2 Sensor Circuit Slow Response in Rich Control Range Bank 2 Sensor 1
- P1095BMW · PowertrainO2 Sensor Circuit Slow Switching From Lean to Rich Bank 1 Sensor 1
- P1096BMW · PowertrainO2 Sensor Circuit Slow Switching From Lean to Rich Bank 2 Sensor 1
- P1097BMW · PowertrainO2 Sensor Circuit Slow Response After Coast Down Fuel Cut-off Bank 1 Sensor 2
- P1098BMW · PowertrainO2 Sensor Circuit Slow Response After Coast Down Fuel Cutoff Bank 2 Sensor 2
- P1111BMW · PowertrainEngine Coolant Temperature Radiator Outlet Sensor Low Input
- P1112BMW · PowertrainEngine Coolant Temperature Radiator Outlet Sensor High Input
- P1115BMW · PowertrainCoolant Temperature Sensor Plausibility
- P1116BMW · PowertrainMass Or Volume Air Flow Circuit Range Performance Problem Bank 2
- P1117BMW · PowertrainMass Or Volume Air Flow Circuit Low Input Bank 2
- P1118BMW · PowertrainMass Or Volume Air Flow Circuit High Input Bank 2
- P1120BMW · PowertrainPedal Position Sensor Circuit
- P1121BMW · PowertrainPedal Position Sensor 1 Range Performance Problem
- P1122BMW · PowertrainPedal Position Sensor 1 Low Input
- P1123BMW · PowertrainPedal Position Sensor 1 High Input
- P1132BMW · PowertrainO2 Sensor Heater Control Circuit Bank 1 Sensor 1
- P1133BMW · PowertrainO2 Sensor Heater Control Circuit Bank 2 Sensor 1
- P1134BMW · PowertrainO2 Sensor Heater Circuit Signal Intermittent Bank 1 Sensor 1
- P1135BMW · PowertrainO2 Sensor Heater Circuit Low Voltage Bank 1 Sensor 1