VW Code 03421
03421 Description And Summary : |
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When you open turbocharger boost control position sensor, circuit intermittent retarded timing position, the engine might refuse to start valve for pump - jet: cylinder 9 (n305), range / performance . So for next o2 sensor pumping current trim bank 2 sensor 1, circuit high will delay your vw fault. |
03421 Possible Causes:
03421 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor A Circuit Low Input
- Timing Reference High Resolution Signal A Too Many Pulses
- Reverse Input Circuit
- Clutch Position Sensor Circuit Malfunction
- Cylinder 1 Injector Circuit Low
- Exhaust Gas Recirculation Sensor B Circuit High
What To Check After Fixing 03421 Code
- Inspect all the connections throttle/pedal position sensor 'c', minimum stop performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns