Hello - sorry it took so long to get back with you. The sensor was where several people had told me to look but you have to crawl under the coach and get in JUST the right position to find it. Ours was about 3/4 back on the passenger side close to the muffler. Our MA has a stabilizer bar on it that everyone seems to think moved it to there instead of on the front axle - so yours might be there. Normally you can adjust it but we found ours was not working at all and needed to be replaced. Since we were going to be in northern Indiana, we had Stuarts in Elkhart replace the unit and now it works!!! Stuarts is great and if you have a problem, we called him and he walked us thru it and decided that the entire unit was not working. Sorry I don't have a number for him but google him at Elkhart, IN. We are sure finding out more about our 2003 Mountainaire daily - it is nice to know someone else that has one. Hope that helps.