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.
- P1125GM · PowertrainAccelerator Pedal Position (APP) System
- P1125GMC · PowertrainAccelerator Pedal Position (APP) System
- P1125Lexus · PowertrainThrottle Control Motor Circuit Malfunction
- P1125Lincoln · PowertrainThrottle Position Sensor Intermittent
- P1125Mazda · PowertrainThrottle Position Sensor Signal Intermittent
- P1125Mercury · PowertrainThrottle Position Sensor Intermittent
- P1125Nissan · PowertrainTandem Throttle Position Sensor Circuit Fault
- P1125Oldsmobile · PowertrainAccelerator Pedal Position APP System
- P1125Other · PowertrainThrottle position sensor intermittent
- P1125Saturn · PowertrainAccelerator Pedal Position APP System
- P1125Toyota · PowertrainThrottle Control Motor Circuit
- P1125Volkswagen · PowertrainLong Term Fuel Trim Add Air Bank 2 System Too Rich
- P1126Lexus · PowertrainMagnetic Clutch Circuit Malfunction
- P1126Mazda · PowertrainThrottle Position Narrow Range Sensor Circuit
- P1126Nissan · PowertrainThermostat Function
- P1126Other · PowertrainThrottle Position (Narrow Range) Sensor Circuit Malfunction
- P1126Toyota · PowertrainMagnetic Clutch Circuit
- P1126Volkswagen · PowertrainLong Term Fuel Trim Add Air Bank 2 System Too Lean
- P1127Ford · PowertrainExhaust Not Warm Enough Downstream O2 Sensor Not Tested
- P1127Kia · PowertrainLong Term Fuel Trim Multiplicative Air System Low
- P1127Lexus · PowertrainECTS Actuator Power Source Circuit Malfunction
- P1127Lincoln · PowertrainExhaust Not Warm Enough Downstream O2 Sensor Not Tested
- P1127Mazda · PowertrainHO2S Bank 1 Sensor 2 Heater Not On During Key On Engine Running Self Test
- P1127Mercury · PowertrainExhaust Not Warm Enough Downstream O2 Sensor Not Tested
- P1127Other · PowertrainExhaust Not Warm, Downstream O2 Sensor
- P1127Toyota · PowertrainETCS Actuator Power Source Circuit
- P1127Volkswagen · PowertrainLong Term Fuel Trim Bank 1 System Too Rich
- P1128Acura · PowertrainMAP Lower Than Expected
- P1128Ford · PowertrainUpstream Heated Oxygen Sensor Signals Reversed
- P1128Honda · PowertrainMAP Lower Than Expected