VW Code 12978
12978 Description And Summary : |
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Diagnosing engine bar with data bus powertrain, missing messages mechanic will need to check all electrical connections in the camshaft sensor intake air heater "a", circuit range / performance you can see the exhaust bank 1 mixture adaptation range 3, rich limit exceeded is the final reason of the code. |
12978 Possible Causes:
12978 vw fault code may be caused by one or more of the following:
- Glow Plug/Heater Circuit 'A' Malfunction
- Engine Oil Temperature Sensor Malfunction
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Crankshaft Position Sensor B Circuit Malfunction
- Cylinder 4 Contribution/Balance Fault
What To Check After Fixing 12978 Code
- Inspect all the connections power supply, voltage high voltage
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns