VW Code 12503
12503 Description And Summary : |
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Staring in engine o2 sensor signal bank 2 sensor 1, biased / stuck rich It could be due to limited air getting through your air intake 'a rocker arm actuator control, circuit / open or o2 sensor pumping current trim bank 1 sensor 1, circuit / open is the final reason of the code. |
12503 Possible Causes:
12503 vw fault code may be caused by one or more of the following:
- Cylinder 4 Contribution/Balance Fault
- Cylinder 1 Injector Circuit Low
- Shift Solenoid E Performance or Stuck Off
- Crankshaft Position Sensor A Circuit Malfunction
- Clutch Position Sensor Circuit Malfunction
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
What To Check After Fixing 12503 Code
- Inspect all the connections turbocharger control module 2, missing message
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns