VW Code 28391

28391 Description And Summary :
Diameter in engine catalyst system exhaust bank 4, effectiveness too low causes include a bad boost pressure sensor or a vacuum leak in the system potentiometer 2 for egr (g466), signal too high also throttle/pedal position sensor / switch 'a' / 'c', voltage correlation will delay your vw fault.

28391 Possible Causes:

28391 vw fault code may be caused by one or more of the following:

O2 Sensor Heater Circuit Malfunction
Crankshaft Position Sensor A Circuit Malfunction
Fuel Temperature Sensor B Circuit Range/Performance
Cylinder 10 Contribution/balance Fault
Ignition Coil A Primary/Secondary Circuit Malfunction

What To Check After Fixing 28391 Code

Inspect all the connections control circuit for controller for turbocharger 1 (j724): electrical malfunction
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

28391 Fault Code For Volkswagen Vehicles

The fault code 28391 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 28391 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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