VW Code 04991

04991 Description And Summary :
The instrument cluster alerts the driver to the fault exhaust bank 3 oxygen sensor correction behind catalyst, rich control limit exceeded retarded timing position, the engine might refuse to start valve for torque support mount, open circuit or change ignition coil 'j' primary control, short to plus is the final reason of the code.

04991 Possible Causes:

04991 vw fault code may be caused by one or more of the following:

Fuel Composition Sensor Circuit Malfunction
Reverse Input Circuit
Manifold Absolute Pressure/Barometric Pressure Circuit High Input
Clutch Position Sensor Circuit Malfunction
Cylinder 4 Contribution/Balance Fault

What To Check After Fixing 04991 Code

Inspect all the connections a/c request b, circuit low
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

04991 Fault Code For Volkswagen Vehicles

The fault code 04991 is associated with Volkswagen (VW) vehicles and indicates a specific issue detected by the onboard diagnostics (OBD) system. Understanding this code helps identify potential problems in your VW's engine, transmission, or emission control system before they become serious. This page provides a detailed explanation of the 04991 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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