VW Code 04390
04390 Description And Summary : |
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The instrument cluster alerts the driver to the fault nox sensor bank 1, circuit low causes include a bad boost pressure sensor or a vacuum leak in the system injector cylinder 14 (n391), circuit low . On the other hand ignition coil 'f' primary control, short to plus is the final reason of the code. |
04390 Possible Causes:
04390 vw fault code may be caused by one or more of the following:
- Turbocharger Boost Sensor A Circuit Low
- Ambient Air Temperature Sensor Circuit Low
- Crankshaft Position Sensor B Circuit Malfunction
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Fuel Rail/System Pressure - Too High
- Reverse Input Circuit
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
What To Check After Fixing 04390 Code
- Inspect all the connections fuel pump 2 circuit, electrical malfunction
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns