The rotors suck on theses and most cars.Once someone posted that all lug nuts shoud be torqed the same to prevent rotor warping and since i started doing that my rotors have lasted quite a bit longer.As far as the security light the same thing has happened on my 01 although it has never failed to start. and i never did anything about it as it stopped coming on.It has done it 3 times in 150k miles.Stay away from the dealer if you can as they will bankrupt you and probley not fix the problem.