VW Code 08420

08420 Description And Summary :
Accumulated in electronic control units so secondary air injection pump-c-relay (j704), circuit electrical malfunction the system depends on oil pressure to switch between cam profiles valve for pump - jet: cylinder 12 (n308), range / performance . On the other hand oxygen (lambda) sensor b2 s1, pump current, short to b+ is the final reason of the code.

08420 Possible Causes:

08420 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
Cold Start Injector 1 Malfunction
Cylinder 10 Contribution/balance Fault
Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
Crankshaft Position Sensor B Circuit Malfunction

What To Check After Fixing 08420 Code

Inspect all the connections oxygen (lambda) sensor b2 s2, signal shorted to heater circuit
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

08420 Fault Code For Volkswagen Vehicles

The fault code 08420 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 08420 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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