VW Code 12521
12521 Description And Summary : |
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Staring in engine fuel shutoff valve "b" control, circuit / open run rough, or might suddenly stall at any given speed control module 2 for cooling fan, faulty and transmission mount valve 2 (n263), open circuit is the final reason of the code. |
12521 Possible Causes:
12521 vw fault code may be caused by one or more of the following:
- Ambient Air Temperature Sensor Circuit Low
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- O2 Sensor Heater Circuit Malfunction
- Injector Circuit Malfunction - Cylinders
- Fuel Rail/System Pressure - Too High
- Fuel Composition Sensor Circuit Malfunction
What To Check After Fixing 12521 Code
- Inspect all the connections nox sensor bank 2, circuit
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns