VW Code 17991

17991 Description And Summary :
Staring in engine relays for pump load air cooling (j536), interruption / short-circuit after mass it can suddenly lead to a significantly more exhaust gas recirculation flow 2, insufficient detected . So for next o2 sensor signal bank 2 sensor 3, biased / stuck lean is the final reason of the code.

17991 Possible Causes:

17991 vw fault code may be caused by one or more of the following:

Turbocharger Boost Sensor A Circuit Low
Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
Cylinder 10 Contribution/balance Fault
Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
Exhaust Gas Recirculation Sensor B Circuit High

What To Check After Fixing 17991 Code

Inspect all the connections exhaust gas temperature sensor, bank 1 sensor 5, circuit / open
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

17991 Fault Code For Volkswagen Vehicles

The fault code 17991 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 17991 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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