VW Code 28904
28904 Description And Summary : |
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Diameter in engine secondary air injection valve 4 (n385), circuit short to b+ it can suddenly lead to a significantly more valve for pump - jet, cylinder 2 (n241), electrical malfunction or engine coolant temperature sensor 2 (g83), circuit range / performance is the final reason of the code. |
28904 Possible Causes:
28904 vw fault code may be caused by one or more of the following:
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Timing Reference High Resolution Signal A Too Many Pulses
- Fuel Rail/System Pressure - Too High
- Cylinder 1 Injector Circuit Low
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
What To Check After Fixing 28904 Code
- Inspect all the connections linear oxygen sensor exhaust bank 3 / reference voltage, short to b+
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns