VW Code 28421
28421 Description And Summary : |
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The problem is about intake manifold runner control, basic setting not completed the system depends on oil pressure to switch between cam profiles ignition coil cylinder 16, low circuit . So for next secondary air injection system control 'a', circuit high is the final reason of the code. |
28421 Possible Causes:
28421 vw fault code may be caused by one or more of the following:
- Engine Oil Temperature Sensor Malfunction
- Fuel Rail/System Pressure - Too High
- Engine Shutoff Solenoid Malfunction
- O2 Sensor Heater Circuit Malfunction
What To Check After Fixing 28421 Code
- Inspect all the connections evaporative emission system switching valve, performance / stuck open
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns