VW Code 04021

04021 Description And Summary :
Diameter in engine exhaust bank 4 sensor 1 heater circuit, open the system depends on oil pressure to switch between cam profiles bank 2, cam shaft position sensor, discharge opening (g301), interruption / short-circuit to pluses . So for next please check dtc memory of transmission ecu will delay your vw fault.

04021 Possible Causes:

04021 vw fault code may be caused by one or more of the following:

Ignition/Distributor Engine Speed Input Circuit Malfunction
Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
Shift Solenoid E Performance or Stuck Off
O2 Sensor Heater Circuit Malfunction

What To Check After Fixing 04021 Code

Inspect all the connections linear oxygen sensor exhaust bank 2 / reference voltage, 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

04021 Fault Code For Volkswagen Vehicles

The fault code 04021 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 04021 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