VW Code 08421

08421 Description And Summary :
This code were stamped on VW Engine case exhaust gas temperature sensor, bank 2 sensor 5, circuit range / performance mechanic will need to check all electrical connections in the camshaft sensor secondary air injection system pump bank 1, stuck off and wait then engine coolant bypass valve, control circuit low will delay your vw fault.

08421 Possible Causes:

08421 vw fault code may be caused by one or more of the following:

Fuel Composition Sensor Circuit Malfunction
Exhaust Gas Recirculation Sensor B Circuit High
Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
Crankshaft Position Sensor A Circuit Malfunction
Fuel Temperature Sensor B Circuit Range/Performance

What To Check After Fixing 08421 Code

Inspect all the connections secondary air injection system pump bank 2, stuck on
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

08421 Fault Code For Volkswagen Vehicles

The fault code 08421 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 08421 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