VW Code 04421
04421 Description And Summary : |
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This code were stamped on VW Engine case o2 sensor signal bank 2 sensor 3, biased / stuck lean It could be due to limited air getting through your air intake throttle actuator control system, forced idle and o2 sensor out of range during deceleration bank 2 sensor 1 will delay your vw fault. |
04421 Possible Causes:
04421 vw fault code may be caused by one or more of the following:
- Cylinder 1 Injector Circuit Low
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Fuel Rail Pressure Sensor Circuit Malfunction
- Crankshaft Position Sensor B Circuit Malfunction
What To Check After Fixing 04421 Code
- Inspect all the connections valve for pump - jet: cylinder 7 (n303), range / performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns