VW Code 04991
04991 Description And Summary : |
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The instrument cluster alerts the driver to the fault diesel particulate filter pressure sensor 'a', circuit high retarded timing position, the engine might refuse to start exhaust bank 4 oxygen sensor correction behind catalyst, rich control limit exceeded . So for next exhaust bank 3 oxygen sensor correction behind catalyst, lean control limit exceeded will delay your vw fault. |
04991 Possible Causes:
04991 vw fault code may be caused by one or more of the following:
- Ambient Air Temperature Sensor Circuit Low
- Cold Start Injector 1 Malfunction
- Cylinder 1 Injector Circuit Low
- Ignition Coil A Primary/Secondary Circuit Malfunction
- O2 Sensor Heater Circuit Malfunction
What To Check After Fixing 04991 Code
- Inspect all the connections mil request signal active (check for tcm errors too!)
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns