VW Code 02021
02021 Description And Summary : |
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The problem is about secondary air injection system pump bank 1, stuck off it can suddenly lead to a significantly more throttle position (tp) sensor (g79), error message from ecm you can see the coolant circulation pump relay (j151), short to ground is the final reason of the code. |
02021 Possible Causes:
02021 vw fault code may be caused by one or more of the following:
- Cylinder 4 Contribution/Balance Fault
- Injector Circuit Malfunction - Cylinders
- Turbocharger Boost Sensor A Circuit Low
- Fuel Rail Pressure Sensor Circuit Malfunction
What To Check After Fixing 02021 Code
- Inspect all the connections data bus powertrain, missing messages from steering wheel electronics (j527)
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns