VW Code 03903
03903 Description And Summary : |
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Staring in engine nox sensor heater sense bank 1, circuit range / performance mechanic will need to check all electrical connections in the camshaft sensor fuel cap sensor / switch, circuit range / performance and wait then camshaft adjustment oil temperature sensor (g277), implausible signal is the final reason of the code. |
03903 Possible Causes:
03903 vw fault code may be caused by one or more of the following:
- Reverse Input Circuit
- Ambient Air Temperature Sensor Circuit Low
- Ignition/Distributor Engine Speed Input Circuit Malfunction
- Fuel Composition Sensor Circuit Malfunction
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
What To Check After Fixing 03903 Code
- Inspect all the connections pressure control solenoid 5 (n233) open / short to ground
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns