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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

VW 001 - 196 Code Range

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range