VW Code 09991
09991 Description And Summary : |
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The problem is about o2 sensor reference voltage bank 1 sensor 1, circuit high It could be due to limited air getting through your air intake ignition switch run position, circuit high . So for next reservoir for additive for particle filter, empty will delay your vw fault. |
09991 Possible Causes:
09991 vw fault code may be caused by one or more of the following:
- Injector Circuit Malfunction - Cylinders
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Ambient Air Temperature Sensor Circuit Low
- Glow Plug/Heater Circuit 'A' Malfunction
- Fuel Rail Pressure Sensor Circuit Malfunction
- Engine Oil Temperature Sensor Malfunction
What To Check After Fixing 09991 Code
- Inspect all the connections secondary air injection system bank 2, high air flow
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns