I've had my car for a little over a week now...and the day I picked it up the "low tire pressure" warning light was on. I let the dealer know right then, and they checked the tire pressure...but it was fine. I haven't had time to take it in for service...but what’s really weird is the light goes off when the tires get wet. This has happened when I washed my car, and all day today since its been raining.

However, the light comes right back on when the car/tires dry off.

 

Same thing happened to me for the first few days I had it. I ran the car semi hard for a bit and it went off and hasnt come back on.