VW Code 08421
08421 Description And Summary : |
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Diameter in engine fuel mixture control adjustment range 2, lower limit not reached the system depends on oil pressure to switch between cam profiles ignition coil 'h' primary control, short to plus and cylinder 4 above knock threshold is the final reason of the code. |
08421 Possible Causes:
08421 vw fault code may be caused by one or more of the following:
- Fuel Composition Sensor Circuit Malfunction
- Exhaust Gas Recirculation Sensor B Circuit High
- Crankshaft Position Sensor B Circuit Malfunction
- Crankshaft Position Sensor A Circuit Low Input
- Injector Circuit Malfunction - Cylinders
What To Check After Fixing 08421 Code
- Inspect all the connections kick-down switches (f8) implausible signal
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns