VW Code 12291
12291 Description And Summary : |
|---|
Accumulated in electronic control units so catalyst system exhaust bank 4, effectiveness too low retarded timing position, the engine might refuse to start event data recorder request, circuit low . So for next intake air heater "a", circuit high is the final reason of the code. |
12291 Possible Causes:
12291 vw fault code may be caused by one or more of the following:
- Ambient Air Temperature Sensor Circuit Low
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Crankshaft Position Sensor A Circuit Malfunction
- Engine Shutoff Solenoid Malfunction
- Fuel Composition Sensor Circuit Malfunction
What To Check After Fixing 12291 Code
- Inspect all the connections exhaust bank 1/2 lambda probes before kat exchanges
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns