Yesterday I had developed the OT and the speed encoder for testing and both returned approx. 1Ohm resistance. So both heal!?
The Wfs I exclude, since, 2x ignition spark as well as turning the starter and a lot of fuel is present.
Would be very grateful for a common troubleshooting with you, because my mechanics buddies and not even the Audi mechanics around me can help me.
If you find the mistake, you get a beer at a fan meeting at some point:-D

(Schipkau)