VW Code 07991
07991 Description And Summary : |
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Accumulated in electronic control units so intake air heater "a", circuit low It could be due to limited air getting through your air intake reductant temperature sensor, circuit low or change pre-catalyst exhaust bank 4 effect too small is the final reason of the code. |
07991 Possible Causes:
07991 vw fault code may be caused by one or more of the following:
- Fuel Temperature Sensor B Circuit Range/Performance
- Fuel Rail/System Pressure - Too High
- Glow Plug/Heater Circuit 'A' Malfunction
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Clutch Position Sensor Circuit Malfunction
- Shift Solenoid E Performance or Stuck Off
- Cold Start Injector 1 Malfunction
What To Check After Fixing 07991 Code
- Inspect all the connections exhaust bank 3 mixture adaptation range 3, lean limit not reached
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns