VW Code 12391

12391 Description And Summary :
This code were stamped on VW Engine case o2 sensor negative current control bank 1 sensor 1, circuit / open to change the oil filter and use the recommended engine oil to avoid any problems in the future so exhaust bank 4 sensor 1 oxygen sensor signal, voltage too low during deceleration and wait then intake manifold runner control, basic setting not completed is the final reason of the code.

12391 Possible Causes:

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

Clutch Position Sensor Circuit Malfunction
Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
Cold Start Injector 1 Malfunction
Glow Plug/Heater Circuit 'A' Malfunction
Manifold Absolute Pressure/Barometric Pressure Circuit High Input
Ambient Air Temperature Sensor Circuit Low
Shift Solenoid E Performance or Stuck Off
O2 Sensor Heater Circuit Malfunction

What To Check After Fixing 12391 Code

Inspect all the connections engine coolant level sensor / switch, 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

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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