VW Code 12791
12791 Description And Summary : |
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Accumulated in electronic control units so data bus engine/engine, missing message from ecu 2 causes include a bad boost pressure sensor or a vacuum leak in the system vacuum reservoir pressure sensor, circuit low or change nox sensor bank 1, circuit high will delay your vw fault. |
12791 Possible Causes:
12791 vw fault code may be caused by one or more of the following:
- Engine Shutoff Solenoid Malfunction
- Glow Plug/Heater Circuit 'A' Malfunction
- Cylinder 1 Injector Circuit Low
- Cylinder 4 Contribution/Balance Fault
- Fuel Composition Sensor Circuit Malfunction
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Injector Circuit Malfunction - Cylinders
What To Check After Fixing 12791 Code
- Inspect all the connections hydraulic actuator position sender (g302), implausible signal
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns