VW Code 12109

12109 Description And Summary :
Diagnosing engine bar with data bus powertrain, incorrect signal from adr control module It could be due to limited air getting through your air intake secondary air injection valve 4 (n385), circuit electrical malfunction . On the other hand injector control pressure, too low is the final reason of the code.

12109 Possible Causes:

12109 vw fault code may be caused by one or more of the following:

Cylinder 1 Injector Circuit Low
Cylinder 4 Contribution/Balance Fault
Engine Shutoff Solenoid Malfunction
Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)

What To Check After Fixing 12109 Code

Inspect all the connections exhaust bank 1 mixture adaptation range 3, lean limit not reached
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

12109 Fault Code For Volkswagen Vehicles

The fault code 12109 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 12109 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

VW 001 - 196 Code Range

Page 1

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range

Page 24