I got a new symptom last night. While backing up and turning sharply, I felt the transfer case tighten up, the 4 wheel drive activating. This tends to support the idea that it is a wheel sensor at fault. Inaccurate wheel speed data is being sent to the calculator. I can't imagine how the SAS or yaw sensor could cause this symptom.

I'm ordering that Carly pack you guys recommended.

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Reno, France near Deutschland
E70 40d LCI nicely kitted out but no bling stuff
E53 3.0d facelift with manual gearbox
E39 530i facelift with manual gearbox
And a couple lesser vehicles of necessity