When I went to the dealer for my 4,000 mile check-up, they told me they had to patch a tire due to a screw. It didn't dawn on me that that my sensors DID NOT go off and had been driving around with a low tire. Ended up that I put aftermarket rims on the Mada and took off the sensors anyway...BUT...when I did take them off... my sensor light NEVER came on and they should have. Do we REALLY need them....how many vehicles have this anyway? I know the Corvette (sp?) does. Maybe they do help...IF THEY WORK! WHO KNOWS?? I could be wrong, but I just said the HECK with 'em.