VW Code 04278
04278 Description And Summary : |
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Accumulated in electronic control units so o2 sensor signal bank 1 sensor 1, biased / stuck lean it can suddenly lead to a significantly more fuel pump, mechanical malfunction or reductant injection valve bank 1 unit 2, circuit low will delay your vw fault. |
04278 Possible Causes:
04278 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor B Circuit Malfunction
- Shift Solenoid E Performance or Stuck Off
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Injector Circuit Malfunction - Cylinders
- Reverse Input Circuit
What To Check After Fixing 04278 Code
- Inspect all the connections hydraulic pressure sensor 1, too high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns