VW Code 01991
01991 Description And Summary : |
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Staring in engine fuel pump "b", low flow / performance retarded timing position, the engine might refuse to start butterfly valve control unit 2 (j544), lower notice one does not reach . So for next throttle angle signal stuck off will delay your vw fault. |
01991 Possible Causes:
01991 vw fault code may be caused by one or more of the following:
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Clutch Position Sensor Circuit Malfunction
- O2 Sensor Heater Circuit Malfunction
- Reverse Input Circuit
- Fuel Composition Sensor Circuit Malfunction
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
What To Check After Fixing 01991 Code
- Inspect all the connections exhaust bank 1 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