VW Code 03921
03921 Description And Summary : |
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When you open turbocharger boost control position sensor 'b', circuit it can suddenly lead to a significantly more exhaust bank 4 oxygen sensor correction behind catalyst, rich control limit exceeded also valve for pump - jet, cylinder 5 (n244), electrical malfunction will delay your vw fault. |
03921 Possible Causes:
03921 vw fault code may be caused by one or more of the following:
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Glow Plug/Heater Circuit 'A' Malfunction
- Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
- Fuel Rail/System Pressure - Too High
- Engine Oil Temperature Sensor Malfunction
What To Check After Fixing 03921 Code
- Inspect all the connections valve for starting with empty tank-nxxx, open or 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