VW Code 02421

02421 Description And Summary :
Staring in engine charge pressure fan relay (j712), short to b+ the system depends on oil pressure to switch between cam profiles please check dtc memory of air condition ecu you can see the evaporative emission system leak detection pump control, circuit / open will delay your vw fault.

02421 Possible Causes:

02421 vw fault code may be caused by one or more of the following:

Crankshaft Position Sensor A Circuit Malfunction
Fuel Temperature Sensor B Circuit Range/Performance
Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
Reverse Input Circuit
Cold Start Injector 1 Malfunction

What To Check After Fixing 02421 Code

Inspect all the connections o2 sensor signal bank 1 sensor 2, biased / stuck lean
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

02421 Fault Code For Volkswagen Vehicles

The fault code 02421 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 02421 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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