Vehicle Diagnostic Protection (also known as SFD - Schutz Fahrzeug Diagnose) is an additional security layer that requires authorization between the vehicle and manufacturer. It may help to protect people from any fraud, by providing information on who and when has made modifications. This protection applies to the models manufactured from 2020 with the MQB Evo (VW Golf 8, Škoda Octavia IV, Seat Leon IV, Audi A3 8Y, Q4, etc.) and the MEB (VW ID.3, ID.4, Škoda Enyaq, etc.) platforms, restricting such features as adaptations, coding, parametrizations.
Control units protected by SFD: Engine Electronics, Central Electrics, Instrument Cluster, Gateway Electrics, Multimedia Unit, etc.