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VW Code 15621

15621 Description And Summary :

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

VW 001 - 196 Code Range

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range