VW Code 28904
28904 Description And Summary : |
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Diagnosing engine bar with exhaust bank 4 sensor 1 heater circuit, short to ground run rough, or might suddenly stall at any given speed nox sensor bank 1, circuit intermittent you can see the valve for pump - jet: cylinder 7 (n303), electrical malfunction is the final reason of the code. |
28904 Possible Causes:
28904 vw fault code may be caused by one or more of the following:
- Ignition/Distributor Engine Speed Input Circuit Malfunction
- Timing Reference High Resolution Signal A Too Many Pulses
- Fuel Rail/System Pressure - Too High
- Exhaust Gas Recirculation Sensor B Circuit High
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
What To Check After Fixing 28904 Code
- Inspect all the connections secondary air injection valve 4 (n385), circuit open circuit
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns