VW Code 13990

13990 Description And Summary :
Accumulated in electronic control units so secondary air injection system air flow/pressure sensor bank 1, circuit to change the oil filter and use the recommended engine oil to avoid any problems in the future so valve for pump - jet: cylinder 11 (n307), regulation range exceeded . So for next o2 sensor signal bank 1 sensor 2, biased / stuck rich is the final reason of the code.

13990 Possible Causes:

13990 vw fault code may be caused by one or more of the following:

Fuel Rail Pressure Sensor Circuit Malfunction
Reverse Input Circuit
Glow Plug/Heater Circuit 'A' Malfunction
Cold Start Injector 1 Malfunction
Engine Oil Temperature Sensor Malfunction
Turbocharger Boost Sensor A Circuit Low

What To Check After Fixing 13990 Code

Inspect all the connections o2 sensor pumping current trim bank 2 sensor 1, 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

13990 Fault Code For Volkswagen Vehicles

The fault code 13990 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 13990 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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