My car has a car alarm installed in it. When I first got my car I would use it all the time. After a while I quit using it because I kept loosing the remote for it. My car really isn’t at risk for theft so I see no purpose in using it. Anyways I disabled it by a button under the dash. It has been disabled for over two years. Today while leaving the store and getting into my car it went off. It was so unexpected that I thought my door hit the car next to me and that the other car was the one with the alarm going off. It was not untill my car wouldn’t start that I knew it was mine. I had to disable it through a series of procedures to turn it off as I didn’t even have the remote with me. How could this have happened? My best guess is some other car out there has the same code as mine with their remote…thats the only thing I can think of, but than again I was under the impression that I disabled it. My check engine light is on and has been on for a while- gas cap. Perhaps there is a 2nd computer problem that the light was also on for?