VW Code 12521

12521 Description And Summary :
Diameter in engine reductant injection air pump control, circuit low retarded timing position, the engine might refuse to start injector cylinder 14 (n391), circuit high . On the other hand angle sensors 2 for butterfly valve drive 2 (g298), signal too small is the final reason of the code.

12521 Possible Causes:

12521 vw fault code may be caused by one or more of the following:

Engine Shutoff Solenoid Malfunction
Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
Cylinder 4 Contribution/Balance Fault
Ambient Air Temperature Sensor Circuit Low
Manifold Absolute Pressure/Barometric Pressure Circuit High Input
Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)

What To Check After Fixing 12521 Code

Inspect all the connections control module defective
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

12521 Fault Code For Volkswagen Vehicles

The fault code 12521 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 12521 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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