Since 2020, the has implemented a robust security layer known as SFD (Schutz Fahrzeug Diagnose), or Vehicle Diagnostic Protection. This firewall-like system restricts advanced diagnostic functions—such as coding, adaptations, and basic settings—on newer models based on the MQB Evo and MEB platforms.

Key systems like Engine Electronics, Central Electrics, Instrument Cluster, and the Multimedia Unit are often locked. How the SFD Unlock Process Works

Volkswagen, Audi, Škoda, SEAT, Bentley, and Lamborghini.

Understanding VAG SFD Protection: Unlocking Diagnostic Access for 2020+ Vehicles