When my low air pressure sensor first went on, I checked all four tires, and my rear drivers side tire was down to about 15 psi. Obviously that isn't good. I checked the tire and didn't see anything wrong with it. Today I was walking inside after parking my car, and I noticed something out of the corner of my eye. There is a nail in my tire. I'll take a picture in a little bit, but boy does this suck. I guess I can get it patched though right? I'll call my dealer tomorrow and talk to him about it. Damn. Hate to have to spend $350 on a new tire already. It's in there pretty good though, and after I filled the tire up a second time over a week ago, the pressure has stayed ok. Don't know how long that will last, and don't like risking it in a car that only has a tire fix kit as it's spare.