VW Code 04020
04020 Description And Summary : |
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The problem is about nox sensor bank 2, circuit low to change the oil filter and use the recommended engine oil to avoid any problems in the future so transmission range display, circuit open also givers 2 for intake air temperature (g299), signal too small is the final reason of the code. |
04020 Possible Causes:
04020 vw fault code may be caused by one or more of the following:
- Glow Plug/Heater Circuit 'A' Malfunction
- Fuel Temperature Sensor B Circuit Range/Performance
- Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
- Ignition/Distributor Engine Speed Input Circuit Malfunction
- Reverse Input Circuit
- Engine Oil Temperature Sensor Malfunction
- Crankshaft Position Sensor A Circuit Malfunction
What To Check After Fixing 04020 Code
- Inspect all the connections o2 sensor reference voltage bank 1 sensor 1, performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns