VW Code 04121
04121 Description And Summary : |
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The problem is about valve 2 for load pressure control (n274), short-circuit after pluses retarded timing position, the engine might refuse to start o2 sensor signal bank 1 sensor 3, biased / stuck rich . On the other hand valve for pump - jet: cylinder 7 (n303), circuit low input is the final reason of the code. |
04121 Possible Causes:
04121 vw fault code may be caused by one or more of the following:
- Exhaust Gas Recirculation Sensor B Circuit High
- Reverse Input Circuit
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Timing Reference High Resolution Signal A Too Many Pulses
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Clutch Position Sensor Circuit Malfunction
- Fuel Composition Sensor Circuit Malfunction
What To Check After Fixing 04121 Code
- Inspect all the connections o2 sensor negative current control bank 2 sensor 1, 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