VW Code 08991
08991 Description And Summary : |
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The problem is about direct ozone reduction catalyst, efficiency below threshold causes include a bad boost pressure sensor or a vacuum leak in the system valve for exhaust flap 2 (n322), open circuit you can see the nox sensor bank 1, circuit will delay your vw fault. |
08991 Possible Causes:
08991 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor B Circuit Malfunction
- Fuel Rail/System Pressure - Too High
- Fuel Composition Sensor Circuit Malfunction
- Engine Oil Temperature Sensor Malfunction
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
What To Check After Fixing 08991 Code
- Inspect all the connections hydraulic pressure sensor 1, range / performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns