VW Code 17991

17991 Description And Summary :
The problem is about heater regulation, implausible signal retarded timing position, the engine might refuse to start fuel injection valve 4 (n369), short to ground. So for next ignition coil 'j' primary control, short to plus will delay your vw fault.

17991 Possible Causes:

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

Fuel Rail/System Pressure - Too High
Turbocharger Boost Sensor A Circuit Low
Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
Fuel Composition Sensor Circuit Malfunction
Glow Plug/Heater Circuit 'A' Malfunction

What To Check After Fixing 17991 Code

Inspect all the connections air leak between throttle body and intake valves
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.

VW 001 - 196 Code Range

Page 1

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range

Page 24