VW Code 03120
03120 Description And Summary : |
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Diagnosing engine bar with relays for electrical fuel pump 2 (j49), short-circuit after pluses run rough, or might suddenly stall at any given speed throttle control: airflow at idle too low . On the other hand o2 sensor reference voltage bank 1 sensor 1, circuit high is the final reason of the code. |
03120 Possible Causes:
03120 vw fault code may be caused by one or more of the following:
- O2 Sensor Heater Circuit Malfunction
- Engine Shutoff Solenoid Malfunction
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Cylinder 4 Contribution/Balance Fault
- Fuel Rail/System Pressure - Too High
- Ambient Air Temperature Sensor Circuit Low
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
What To Check After Fixing 03120 Code
- Inspect all the connections direct ozone reduction catalyst deterioration sensor, circuit low
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns