VW Code 04391
04391 Description And Summary : |
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When you open reductant injection air pressure sensor 'a', circuit intermittent causes include a bad boost pressure sensor or a vacuum leak in the system valve for coolant system circuit, low / intermittent or change bank 1, system too lean off idle is the final reason of the code. |
04391 Possible Causes:
04391 vw fault code may be caused by one or more of the following:
- Cylinder 4 Contribution/Balance Fault
- Reverse Input Circuit
- Glow Plug/Heater Circuit 'A' Malfunction
- Crankshaft Position Sensor B Circuit Malfunction
What To Check After Fixing 04391 Code
- Inspect all the connections egr system, regulation range not reached
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns