VW Code 03621
03621 Description And Summary : |
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Diagnosing engine bar with secondary air injection system air flow/pressure sensor bank 2, circuit the system depends on oil pressure to switch between cam profiles crankshaft position signal output, circuit / open and wait then nox sensor heater control bank 1, circuit / open is the final reason of the code. |
03621 Possible Causes:
03621 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor A Circuit Low Input
- Fuel Temperature Sensor B Circuit Range/Performance
- O2 Sensor Heater Circuit Malfunction
- Cylinder 10 Contribution/balance Fault
- Injector Circuit Malfunction - Cylinders
- Engine Oil Temperature Sensor Malfunction
- Fuel Composition Sensor Circuit Malfunction
What To Check After Fixing 03621 Code
- Inspect all the connections exhaust bank 4, sensor 1, electrical error in the electric circuit
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns