VW Code 03801
03801 Description And Summary : |
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The problem is about data bus powertrain, missing message from diagnostic interface-control module It could be due to limited air getting through your air intake intake manifold flap; bank 1, stuck open . On the other hand valve for pump - jet: cylinder 8 (3040), electrical malfunction will delay your vw fault. |
03801 Possible Causes:
03801 vw fault code may be caused by one or more of the following:
- Cylinder 4 Contribution/Balance Fault
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
- Exhaust Gas Recirculation Sensor B Circuit High
- Crankshaft Position Sensor B Circuit Malfunction
- Fuel Rail/System Pressure - Too High
- Fuel Rail Pressure Sensor Circuit Malfunction
What To Check After Fixing 03801 Code
- Inspect all the connections exhaust bank 4, sensor 2, internal resistance too largely
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns