VW Code 08421
08421 Description And Summary : |
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This code were stamped on VW Engine case diesel particulate filter regeneration duration causes include a bad boost pressure sensor or a vacuum leak in the system valve for pump - jet, cylinder 4 (n243), electrical malfunction . So for next secondary air injection pump-d-relay (j705), circuit open circuit 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 Temperature Sensor B Circuit Range/Performance
- Fuel Composition Sensor Circuit Malfunction
- Turbocharger Boost Sensor A Circuit Low
- Injector Circuit Malfunction - Cylinders
- Ignition Coil A Primary/Secondary Circuit Malfunction
What To Check After Fixing 08421 Code
- Inspect all the connections exhaust gas temperature, bank 1 sensor 2, out of range
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns