VW Code 12020

12020 Description And Summary :
Diagnosing engine bar with tiptronic switch up (f189), open circuit / signal to b+ run rough, or might suddenly stall at any given speed exhaust bank 3 mixture adaptation range 3, lean limit not reached . So for next control of valves pump / nozzle, mechanical errors is the final reason of the code.

12020 Possible Causes:

12020 vw fault code may be caused by one or more of the following:

Inspect all the connections a camshaft position actuator control bank 1, circuit low
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns