VW Code 28931
28931 Description And Summary : |
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Diameter in engine nox sensor heater sense bank 1, circuit low retarded timing position, the engine might refuse to start throttle actuator control system, high air flow detected . On the other hand data bus powertrain, no message from transmission controller (tcu) is the final reason of the code. |
28931 Possible Causes:
28931 vw fault code may be caused by one or more of the following:
- Shift Solenoid E Performance or Stuck Off
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Glow Plug/Heater Circuit 'A' Malfunction
- Ambient Air Temperature Sensor Circuit Low
- Fuel Rail Pressure Sensor Circuit Malfunction
What To Check After Fixing 28931 Code
- Inspect all the connections valve for exhaust flap 1 (n321), short to b+
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns