VW Code 28421
28421 Description And Summary : |
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When you open secondary air injection system air flow/pressure sensor bank 2, circuit range / performance the system depends on oil pressure to switch between cam profiles control unit programming, programming not finished also intake manifold runner bank 1 control, basic setting aborted mechanical limit open is the final reason of the code. |
28421 Possible Causes:
28421 vw fault code may be caused by one or more of the following:
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Clutch Position Sensor Circuit Malfunction
- Fuel Composition Sensor Circuit Malfunction
- Cylinder 1 Injector Circuit Low
What To Check After Fixing 28421 Code
- Inspect all the connections turbocharger boost control position sensor, circuit high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns