VW Code 15621
15621 Description And Summary : |
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Staring in engine o2 sensor negative current control bank 1 sensor 1, circuit high it can suddenly lead to a significantly more turbo/super charger over-boost condition or change bank 1 sensor 1, internal resistance too high is the final reason of the code. |
15621 Possible Causes:
15621 vw fault code may be caused by one or more of the following:
- Cylinder 10 Contribution/balance Fault
- Cylinder 1 Injector Circuit Low
- Cylinder 4 Contribution/Balance Fault
- Cold Start Injector 1 Malfunction
- Injector Circuit Malfunction - Cylinders
What To Check After Fixing 15621 Code
- Inspect all the connections pressure control solenoid 2 (n216), short to b+
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns