Hi, I have the air struts in the back, unfortnately the rear is very low and riding very rough. I changed the struts 2 years ago. My garage said it is the leveling sensor.
Is there any other parts govering the suspension back there??

Where can I get some parts for it and how much??? Thanks for any replies

What model and year?
Under the hood, at the left center side of the firewall (as viewed from front of car) is a relay and fuse block.

There is an ELC relay that provides power to the motor when the height sensor tells it. On my 93, it is the 3rd from the left as you are viewing from the front of car. This one caused the same problem on mine. Very inexpensive. I had the wife trip the inflator switch in the trunk on and off, while I felt to see which one was clicking. That'* the one I replaced to fix it.

The fuse is #12 on the interior fuse panel near the steering column. It is a 20 amp.

Finally, the ground for this circuit is G104, which is about 3 black wires grounded on the front driver fender, near the washer fluid tank. Suggest removing screw and brushing those wires up.

Bill