VW Code 03990
03990 Description And Summary : |
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This something to do with the intake camshaft timing starter does not run, mechanically blocked or mechanical malfunction retarded timing position, the engine might refuse to start o2 sensor negative current control bank 1 sensor 1, circuit high . On the other hand powertrain databus, implausible engine temperature message from inst. is the final reason of the code. |
03990 Possible Causes:
03990 vw fault code may be caused by one or more of the following:
- Crankshaft Position Sensor B Circuit Malfunction
- Injector Circuit Malfunction - Cylinders
- Reverse Input Circuit
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Crankshaft Position Sensor A Circuit Low Input
What To Check After Fixing 03990 Code
- Inspect all the connections planetary overdrive / low range, mechanical malfunction
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns