VW Code 12921
12921 Description And Summary : |
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When you open intake air heater "a", circuit mechanic will need to check all electrical connections in the camshaft sensor throttle actuator control system, forced limited rpm . On the other hand transmission range display, circuit short to ground will delay your vw fault. |
12921 Possible Causes:
12921 vw fault code may be caused by one or more of the following:
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Reverse Input Circuit
- Glow Plug/Heater Circuit 'A' Malfunction
- Engine Shutoff Solenoid Malfunction
What To Check After Fixing 12921 Code
- Inspect all the connections exhaust bank 4 oxygen sensor before catalyst, heater circuit, regulation at upper limit
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns