If you recall, I had both crankshaft position sensors replaced in my 2000 STS. Once replaced, "Service Suspension SYS" appeared on the DIC. I went right back to the dealers (sure they screwed something up) and they said the ride height sensor had come undone while the crankshaft position sensors were replaced. Well, 2 weeks later, the same alert is on the DIC, which I am sure is the same problem. Can I find this sensor myself? Or do I have to take the car in YET AGAIN to have the ride height sensor reconnected?
Any help will be most appreciated!

I'm not sure how a ride height sensor comes off while doing the crankshaft position sensors. You don't even have to remove a wheel to replace the crankshaft sensors. It doesn't make any sense.

The ride height sensors are very easy to replace and the part is not that much either. It's connected to the control arm with a ball-and-socket arrangement and attached to the frame with a single nut. The hardest part is removing the tire. You have to figure out which sensor it is, though....

Jim

The ride height sensor is attached to the inner wheel well. It uses a small metal rod with two plastic ball cups on either end to connect to the lower control arm. This is how it measure the height of the suspension. These ball cups can wear out over time, and pop off. The hole that the metal rod fits into can also loosen up over time, causing the rod to simply slip out of the ball cup. leaving it hanging from either the sensor or the control arm. If you get a jack under the front or rear of the car, and lift it up, you can easily see the sensor and rod. A quick glance will tell wether or not everything is attached, or has come apart. If the ball cups/metal rod have become dettached from eachother, get some suprglue, and use it to re-attache them (note, only do this if slipping the metal rod back into the ball cup). If the ball cup itself has fallen off of either the sensor or the control arm, than it is worn and must be replaced. I doubt that you can get these parts individually from the dealer, but you might want to try http://www.rockauto.com . They usually have some hard to find pieces liek these. Also, the front and rear assemblies are pretty much the same, but if they mention a front/rear specific part, get the one that applies. Better safe than sorry....Good Luck.
I'll take a picture of the one on my car, so you can get a better idea....

The reason that the rod(s) came off during the crank sensor replacement procedure is that we lower the engine cradle to allow better access to the sensors. When the front two bolts are removed from the cradle it drops down giving you lots of space, but also it pulls the rods down if you don't disconnect them. Since the other ends of the rods are fixed on the body and they don't stretch, the pop out. Sometimes the tech can get in a hurry and forget to disconnect the rods, causing them to come apart, or he can forget to reattach them after he's done.
If they came apart when the sensors were replaced and you took it back, they should have reconnected both of them. It's possible that they didn't do a good enough job, so it might be worth having them take one more look.

It's carlessness on their part.

If you turn the front wheels all the way to the left and look inside the wheelhouse you should be able to see if the rods are disconnected. On '01 Deville you should find them on the rear edge of the lower control arm going up to the sensor which is mounted on the body just to the rear of the strut.

The reason that the rod(s) came off during the crank sensor replacement procedure is that we lower the engine cradle to allow better access to the sensors. .

That makes sense. I wish I had known that when I did mine. I followed the FSM for a little while but it started to get crazy - removing the motor mount and whatnot. I took some advice from here and did it with little hassle but it was tight in there.

Jim

I lower the cradle and use a swivel socket.
It's still a pain in the rear but it is considerably easier with a bit more room.

Sometimes I catch myself leaving the rods off, I usually check for the rods before I begin and really try to double check myself when I am done.