VW Code 00421
00421 Description And Summary : |
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Diagnosing engine bar with mil call-up circuit / transmission control module, range / performance mechanic will need to check all electrical connections in the camshaft sensor turbocharger boost control position sensor, circuit low . So for next intake manifold tuning (imt) valve position sensor / switch bank 1, circuit high will delay your vw fault. |
00421 Possible Causes:
00421 vw fault code may be caused by one or more of the following:
- Shift Solenoid E Performance or Stuck Off
- Fuel Rail/System Pressure - Too High
- Turbocharger Boost Sensor A Circuit Low
- Fuel Composition Sensor Circuit Malfunction
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
What To Check After Fixing 00421 Code
- Inspect all the connections nox sensor heater control bank 2, circuit / open
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns