VW Code 12691

12691 Description And Summary :
Staring in engine linear oxygen sensor exhaust bank 4 / pump current, short to ground retarded timing position, the engine might refuse to start exhaust bank 4 sensor 1 heater circuit, internal resistance too large you can see the ecm/pcm power relay sense, circuit intermittent will delay your vw fault.

12691 Possible Causes:

12691 vw fault code may be caused by one or more of the following:

O2 Sensor Heater Circuit Malfunction
Glow Plug/Heater Circuit 'A' Malfunction
Cylinder 4 Contribution/Balance Fault
Crankshaft Position Sensor A Circuit Malfunction
Fuel Rail Pressure Sensor Circuit Malfunction
Manifold Absolute Pressure/Barometric Pressure Circuit High Input

What To Check After Fixing 12691 Code

Inspect all the connections exhaust bank 3, probe 2 heating circuit short-circuit after pluses
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

12691 Fault Code For Volkswagen Vehicles

The fault code 12691 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 12691 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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