SFD

What is SFD?

SFD (Schutz der Fahrzeugdiagnose) replaces the older login and [Security Access] codes you may have seen on V.A.G cars. Previously when doing things like brake pad replacement, you may have used a [Security Access] code to unlock the module and retract the callipers so you could push the pistons back and replace the brake pads

On later model cars this has been replaced with a two way handshake between the diagnostic tool/car and VW/Audi online servers. 

VCDS can now process the handshake online with the VW/Audi servers and unlock modules on the later model cars and they have opened the service to a public beta test in preparation to go fully live with it

If you have cars with SFD and need this service, you can join the public beta test

Please see this video and the forum post for details on how to join

https://forums.ross-tech.com/index.php?threads/54647/