VW Code 17921

17921 Description And Summary :
Diameter in engine hydraulic pump for overdrive / low range (v190), electrical malfunction causes include a bad boost pressure sensor or a vacuum leak in the system fuel supply heater, control circuit / open . So for next shift lock, malfunction is the final reason of the code.

17921 Possible Causes:

17921 vw fault code may be caused by one or more of the following:

Ignition/Distributor Engine Speed Input Circuit Malfunction
Engine Oil Temperature Sensor Malfunction
Reverse Input Circuit
Fuel Rail/System Pressure - Too High
Crankshaft Position Sensor A Circuit Malfunction
Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)

What To Check After Fixing 17921 Code

Inspect all the connections exhaust gas recirculation throttle control, circuit 'a' high
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

17921 Fault Code For Volkswagen Vehicles

The fault code 17921 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 17921 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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