VW Code 04020

04020 Description And Summary :
When you open glow plug / heater indicator (k29), circuit open / short to ground retarded timing position, the engine might refuse to start throttle position (tp) sensor 1-2, correlation also camshaft position signal output, circuit high is the final reason of the code.

04020 Possible Causes:

04020 vw fault code may be caused by one or more of the following:

Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
Cylinder 4 Contribution/Balance Fault
Ignition Coil A Primary/Secondary Circuit Malfunction
Engine Shutoff Solenoid Malfunction
Injector Circuit Malfunction - Cylinders
Cylinder 10 Contribution/balance Fault
Clutch Position Sensor Circuit Malfunction

What To Check After Fixing 04020 Code

Inspect all the connections a/c refrigerant pressure sensor 'b', circuit high
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

04020 Fault Code For Volkswagen Vehicles

The fault code 04020 is associated with Volkswagen (VW) vehicles and indicates a specific issue detected by the onboard diagnostics (OBD) system. Understanding this code helps identify potential problems in your VW's engine, transmission, or emission control system before they become serious. This page provides a detailed explanation of the 04020 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

VW 001 - 196 Code Range

Page 1

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range

Page 24