On the -40F and the sensor, etc., to be clear, in my case, I had that, and there was absolutely nothing at all wrong with the car, other than that my son had left something on that drained the battery overnight. There was no problem at all with the sensor.
BTW, I'll see if I can find my thread when that problem popped up - the forum here was split between whether my son had done some urban off-road driving to shear off the sensor or that my battery was toast. Luckily my cautious skeptical patience easily led me to the correct answer in my case.
Here it is:
https://xoutpost.com/bmw-sav-forums/...wing-40-f.html
And there's a good pic in there of the sensor - it's on the lower right side behind the bumper.
Similarly, my guess on the AT is that there is nothing at all wrong with the AT. Just that there is some voltage fluctuation somewhere in the car (battery, alternator, relay, connector, ...) that is giving the TRANS FAILSAFE PROG.
So, for example, maybe the thing that is causing your steering wheel / seat issues is the problem, and these -40F and TRANS... are confusing side effects.
I would work on the thing that you know you've got a problem with first. Put your battery on a charger, check that connections are clean and tight, etc.