VW Code 03904
03904 Description And Summary : |
|---|
The instrument cluster alerts the driver to the fault intake air heater "a", circuit low run rough, or might suddenly stall at any given speed butterfly valve control unit 2 (j544), of mechanical errors also secondary air injection system control 'a', circuit high is the final reason of the code. |
03904 Possible Causes:
03904 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor B Circuit Malfunction
- Reverse Input Circuit
- Crankshaft Position Sensor A Circuit Malfunction
- Ambient Air Temperature Sensor Circuit Low
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Cylinder 1 Injector Circuit Low
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Engine Shutoff Solenoid Malfunction
What To Check After Fixing 03904 Code
- Inspect all the connections injector control pressure regulator, circuit / open
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns