VW Code 03121
03121 Description And Summary : |
|---|
The instrument cluster alerts the driver to the fault fuel additive control module requested mil illumination retarded timing position, the engine might refuse to start nox sensor heater sense bank 2, circuit or change coolant degassing valve, control circuit low is the final reason of the code. |
03121 Possible Causes:
03121 vw fault code may be caused by one or more of the following:
- Clutch Position Sensor Circuit Malfunction
- Injector Circuit Malfunction - Cylinders
- Cold Start Injector 1 Malfunction
- O2 Sensor Heater Circuit Malfunction
- Timing Reference High Resolution Signal A Too Many Pulses
What To Check After Fixing 03121 Code
- Inspect all the connections exhaust bank 3, probe 2 heating circuit of electrical errors
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns