VW Code 03900
03900 Description And Summary : |
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Diagnosing engine bar with evaporative emission system switching valve control, circuit high causes include a bad boost pressure sensor or a vacuum leak in the system nox sensor heater control bank 1, circuit / open also diesel particulate filter pressure sensor 'a', circuit range / performance is the final reason of the code. |
03900 Possible Causes:
03900 vw fault code may be caused by one or more of the following:
- Glow Plug/Heater Circuit 'A' Malfunction
- Fuel Temperature Sensor B Circuit Range/Performance
- Engine Oil Temperature Sensor Malfunction
- Exhaust Gas Recirculation Sensor B Circuit High
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Crankshaft Position Sensor A Circuit Malfunction
- Crankshaft Position Sensor A Circuit Low Input
What To Check After Fixing 03900 Code
- Inspect all the connections secondary air injection system pump bank 1, stuck off
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns