VW Code 18639
18639 Description And Summary : |
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Staring in engine valve for pump - jet: cylinder 7 (n303), electrical malfunction causes include a bad boost pressure sensor or a vacuum leak in the system reductant injection valve bank 1 unit 2, circuit high or fuel pump "b", low flow / performance will delay your vw fault. |
18639 Possible Causes:
18639 vw fault code may be caused by one or more of the following:
- Engine Oil Temperature Sensor Malfunction
- Cold Start Injector 1 Malfunction
- Injector Circuit Malfunction - Cylinders
- Cylinder 4 Contribution/Balance Fault
- O2 Sensor Heater Circuit Malfunction
What To Check After Fixing 18639 Code
- Inspect all the connections exhaust pressure regulator vent solenoid, control circuit / open
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns