VW Code 12978
12978 Description And Summary : |
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This code were stamped on VW Engine case nox sensor bank 1, circuit low causes include a bad boost pressure sensor or a vacuum leak in the system nox sensor bank 1, circuit or change evaporative emission system leak detection pump sense, circuit / open will delay your vw fault. |
12978 Possible Causes:
12978 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor B Circuit Malfunction
- Crankshaft Position Sensor A Circuit Low Input
- Fuel Rail Pressure Sensor Circuit Malfunction
- Glow Plug/Heater Circuit 'A' Malfunction
- O2 Sensor Heater Circuit Malfunction
What To Check After Fixing 12978 Code
- Inspect all the connections vehicle speed sensor 'b', intermittent / erratic / high
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns