I bought a new '08 Honda Civic several months ago. A few weeks ago I had a blowout and after the new tire was put on the low pressure light stayed on. Shortly thereafter I returned to the dealership where I bought the car and asked them what it would take to disable the light, figuring it wouldn't cost anything. Instead I was told that it would cost $170 to replace a sensor. I was also told that perhaps the guy who changed my tire had inadvertently damaged the sensor. Or that it could've been damaged when the blowout occurred. Anyhow, my dealer wanted to charge me $170 to replace it! My brother who's in the tire business advised me to just forget about it and drive with the light on, which is what I've done. Then last week I noticed that the low pressure light had gone out but that a new light, TPMS, had come on and is still on. I'm figuring that if no damage was done driving with the low pressure light on, then it's probably okay to drive with the TPMS light on. At any rate, I can't see paying $170 per sensor anytime I have a similar problem. I figure if there's really a problem, my warranty should cover it.
When I first informed my salesperson about the low pressure light staying on, he told me that my car was under warranty and I would not be charged to turn it off. Obviously, the service department told me differently. In the meantime, I continue to drive with the TPMS light on, hoping that all is okay.