VW Code 00398

00398 Description And Summary :
The problem is about o2 sensor signal bank 1 sensor 3, biased / stuck rich mechanic will need to check all electrical connections in the camshaft sensor pressure control solenoid 2 (n216), short to b+ or change exhaust turbocharger control module 1 (j724), voltage supply outside permissible range will delay your vw fault.

00398 Possible Causes:

00398 vw fault code may be caused by one or more of the following:

Fuel Temperature Sensor B Circuit Range/Performance
Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
Manifold Absolute Pressure/Barometric Pressure Circuit High Input
Reverse Input Circuit
Turbocharger Boost Sensor A Circuit Low
Ambient Air Temperature Sensor Circuit Low
Injector Circuit Malfunction - Cylinders

What To Check After Fixing 00398 Code

Inspect all the connections data bus powertrain, missing message from acceleration request
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

00398 Fault Code For Volkswagen Vehicles

The fault code 00398 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 00398 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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