VW Code 04121
04121 Description And Summary : |
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Diagnosing engine bar with idle speed control throttle position 2, electrical malfunction retarded timing position, the engine might refuse to start throttle angle signal stuck off or change ignition coil 'f' primary control, circuit low will delay your vw fault. |
04121 Possible Causes:
04121 vw fault code may be caused by one or more of the following:
- Fuel Temperature Sensor B Circuit Range/Performance
- Injector Circuit Malfunction - Cylinders
- Cylinder 4 Contribution/Balance Fault
- Clutch Position Sensor Circuit Malfunction
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Engine Shutoff Solenoid Malfunction
- Turbocharger Boost Sensor A Circuit Low
What To Check After Fixing 04121 Code
- Inspect all the connections linear oxygen sensor exhaust bank 4, compensation wire pump current, open circuit
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns