You don't have to waste $230 dollars on an oil change tech shaking your ride height sensor, either I think it's pretty obvious what is wrong just from what I've read. Just go get a new sensor and put it in. I just don't understand the I have a 99 Cadillac, but I want some shadetree hack to work on it mentality. Go somewhere where they know what the hell they are doing, if you can't find a shop that will stand behind their work, go to the dealer, but right now he's pissing away money in the name of saving money which makes absolutely no sense.