VW Code 06521

06521 Description And Summary :
The instrument cluster alerts the driver to the fault secondary air injection pump-d-relay (j705), circuit open circuit causes include a bad boost pressure sensor or a vacuum leak in the system idle regulation lean operation: rpm too high also transmission solenoid power relay, short to ground will delay your vw fault.

06521 Possible Causes:

06521 vw fault code may be caused by one or more of the following:

Fuel Rail Pressure Sensor Circuit Malfunction
Ignition/Distributor Engine Speed Input Circuit Malfunction
Cylinder 4 Contribution/Balance Fault
Timing Reference High Resolution Signal A Too Many Pulses
Crankshaft Position Sensor A Circuit Low Input
Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
Ambient Air Temperature Sensor Circuit Low

What To Check After Fixing 06521 Code

Inspect all the connections coolant degassing valve, control 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

06521 Fault Code For Volkswagen Vehicles

The fault code 06521 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 06521 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