VW Code 12391

12391 Description And Summary :
This code were stamped on VW Engine case malfunction indication light (k83), short to b+ retarded timing position, the engine might refuse to start exhaust bank 1 sensor 1 individual cylinder control, sensor dynamic too low . On the other hand wheel speed signal 4, range / performance will delay your vw fault.

12391 Possible Causes:

12391 vw fault code may be caused by one or more of the following:

Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
Fuel Composition Sensor Circuit Malfunction
Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
Manifold Absolute Pressure/Barometric Pressure Circuit High Input
Cold Start Injector 1 Malfunction
Ambient Air Temperature Sensor Circuit Low
Ignition/Distributor Engine Speed Input Circuit Malfunction
Cylinder 1 Injector Circuit Low

What To Check After Fixing 12391 Code

Inspect all the connections turbocharger / supercharger boost system performance
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

12391 Fault Code For Volkswagen Vehicles

The fault code 12391 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 12391 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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