I will try to reset the ride height sensors.
I will also run inpa instead of ISTA to get any other info.

It is baffling and is destroying my faith in this car. I would like just to find a broken part then replace it and go forward. This problem has been haunting me for a few months. Just in the last couple of weeks I was able to get a software set up to test it. ISTA does not show offset of sensors,not that I can find.

I can hear the air venting when I ask for a level change at the compressor. Is there a computer controlled exhaust valve at the compressor that could be malfunctioning also?

Gary