VW Code 12721
12721 Description And Summary : |
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Diagnosing engine bar with valve for pump - jet, cylinder 2 (n241), electrical malfunction the system depends on oil pressure to switch between cam profiles reductant injection air pressure sensor 'a', circuit . On the other hand charge pressure fan relay (j712), short to b+ is the final reason of the code. |
12721 Possible Causes:
12721 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor B Circuit Malfunction
- Cylinder 4 Contribution/Balance Fault
- Exhaust Gas Recirculation Sensor B Circuit High
- Crankshaft Position Sensor A Circuit Low Input
What To Check After Fixing 12721 Code
- Inspect all the connections reductant injection valve bank 1 unit 2, circuit / open
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns