VW Code 03720
03720 Description And Summary : |
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The problem is about linear oxygen sensor exhaust bank 3 / pump current, short to b+ it can suddenly lead to a significantly more charge pressure fan relay (j712), short to ground+ . So for next data-bus powertrain, missing message from engine controller (ecu) is the final reason of the code. |
03720 Possible Causes:
03720 vw fault code may be caused by one or more of the following:
- Shift Solenoid E Performance or Stuck Off
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Engine Shutoff Solenoid Malfunction
- Ambient Air Temperature Sensor Circuit Low
- Clutch Position Sensor Circuit Malfunction
- Injector Circuit Malfunction - Cylinders
- Reverse Input Circuit
What To Check After Fixing 03720 Code
- Inspect all the connections intake flap motor 2 (v275), 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