The tire pressure warning light came on an stayed on within a few days of switching to my winter tires. Tire pressures were fine and I realized that I probably had a broken sensor. Took the car in to the dealer that I originally purchased the car from and explained. The bill for replacing the sensor was $369.61 before tax. $130 to diagnose which sensor it was and that it was really broken, $109.61 for the valve sub-assembly-tire, and another $130 to install and program the sensor. I have absolutely no frame of reference for this, but it seems to me that replacing a sensor shouldn't be this big a deal. Can anyone offer an opinion as the whether I just don't appreciate how much is involved, or whether I just got taken to the cleaners? Thanks for your input!