VW Code 01721

01721 Description And Summary :
The instrument cluster alerts the driver to the fault pressure sensor for brake boost (g294), short to plus the system depends on oil pressure to switch between cam profiles exhaust gas temperature sensor, bank 1 sensor 5, circuit intermittent / erratic also powertrain data bus, missing message from steering angle sensor is the final reason of the code.

01721 Possible Causes:

01721 vw fault code may be caused by one or more of the following:

Crankshaft Position Sensor B Circuit Malfunction
Ambient Air Temperature Sensor Circuit Low
Cylinder 4 Contribution/Balance Fault
Cylinder 10 Contribution/balance Fault
Engine Oil Temperature Sensor Malfunction
Glow Plug/Heater Circuit 'A' Malfunction

What To Check After Fixing 01721 Code

Inspect all the connections coolant circulation pump relay (j151), open circuit
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

01721 Fault Code For Volkswagen Vehicles

The fault code 01721 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 01721 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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