VW Code 04021
04021 Description And Summary : |
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This code were stamped on VW Engine case accelerator pedal position sensor 1 (g79), power supply malfunction run rough, or might suddenly stall at any given speed transmission mount valve 2 (n263), open circuit and diesel particulate filter differential pressure too high bank 2 is the final reason of the code. |
04021 Possible Causes:
04021 vw fault code may be caused by one or more of the following:
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Ambient Air Temperature Sensor Circuit Low
- Cold Start Injector 1 Malfunction
- Fuel Composition Sensor Circuit Malfunction
- Injector Circuit Malfunction - Cylinders
What To Check After Fixing 04021 Code
- Inspect all the connections ignition coil 'b' secondary circuit, malfunction
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns