VW Code 01521

01521 Description And Summary :
When you open coolant pump control, circuit high the system depends on oil pressure to switch between cam profiles throttle position (tp) sensor 1-2, correlation or change linear oxygen sensor exhaust bank 3 / common ground wire, short to ground is the final reason of the code.

01521 Possible Causes:

01521 vw fault code may be caused by one or more of the following:

Glow Plug/Heater Circuit 'A' Malfunction
O2 Sensor Heater Circuit Malfunction
Injector Circuit Malfunction - Cylinders
Ambient Air Temperature Sensor Circuit Low
Fuel Temperature Sensor B Circuit Range/Performance

What To Check After Fixing 01521 Code

Inspect all the connections secondary air injection system air flow/pressure sensor bank 2, circuit high
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

01521 Fault Code For Volkswagen Vehicles

The fault code 01521 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 01521 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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