VW Code 03921
03921 Description And Summary : |
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Diagnosing engine bar with bank 2, cam shaft position sensor, discharge opening (g301), short-circuit to mass causes include a bad boost pressure sensor or a vacuum leak in the system data bus powertrain, missing message from clutch control also secondary air injection valve 4 (n385), circuit electrical malfunction will delay your vw fault. |
03921 Possible Causes:
03921 vw fault code may be caused by one or more of the following:
- Glow Plug/Heater Circuit 'A' Malfunction
- Turbocharger Boost Sensor A Circuit Low
- O2 Sensor Heater Circuit Malfunction
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Fuel Temperature Sensor B Circuit Range/Performance
What To Check After Fixing 03921 Code
- Inspect all the connections mil request signal active (check for tcm errors too!)
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns