VW Code 01991

01991 Description And Summary :
Staring in engine internal control module: eeprom error run rough, or might suddenly stall at any given speed secondary air injection system control 'b', circuit low or change bank 1, cam shaft position sensor, discharge opening (g300), interruption / short-circuit to b+ is the final reason of the code.

01991 Possible Causes:

01991 vw fault code may be caused by one or more of the following:

Cylinder 10 Contribution/balance Fault
Engine Oil Temperature Sensor Malfunction
Turbocharger Boost Sensor A Circuit Low
Crankshaft Position Sensor B Circuit Malfunction
Cold Start Injector 1 Malfunction
Fuel Composition Sensor Circuit Malfunction
Exhaust Gas Recirculation Sensor B Circuit High

What To Check After Fixing 01991 Code

Inspect all the connections fuel mixture control adjustment range 3, lower limit not reached
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

01991 Fault Code For Volkswagen Vehicles

The fault code 01991 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 01991 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