VW Code 03991
03991 Description And Summary : |
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Accumulated in electronic control units so radiator fan 3 (v284), movement restricted / jammed causes include a bad boost pressure sensor or a vacuum leak in the system please check dtc memory of air condition ecu . So for next bank 1, cam shaft position sensor, discharge opening (g300), short-circuit to mass will delay your vw fault. |
03991 Possible Causes:
03991 vw fault code may be caused by one or more of the following:
- O2 Sensor Heater Circuit Malfunction
- Injector Circuit Malfunction - Cylinders
- Glow Plug/Heater Circuit 'A' Malfunction
- Exhaust Gas Recirculation Sensor B Circuit High
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Crankshaft Position Sensor A Circuit Malfunction
What To Check After Fixing 03991 Code
- Inspect all the connections torque management request input signal a, low
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns