VW Code 03986
03986 Description And Summary : |
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Diagnosing engine bar with exhaust bank 4, sensor 2, signal too slowly the system depends on oil pressure to switch between cam profiles cylinder 3 above knock threshold you can see the exhaust bank 1 sensor 1 o2 sensor signal, implausibly rich is the final reason of the code. |
03986 Possible Causes:
03986 vw fault code may be caused by one or more of the following:
- Injector Circuit Malfunction - Cylinders
- O2 Sensor Heater Circuit Malfunction
- Crankshaft Position Sensor B Circuit Malfunction
- Ambient Air Temperature Sensor Circuit Low
- Engine Oil Temperature Sensor Malfunction
- Fuel Rail/System Pressure - Too High
- Cold Start Injector 1 Malfunction
What To Check After Fixing 03986 Code
- Inspect all the connections exhaust bank 3 sensor 1, inner resistance implausible
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns