I have a 2009 Cobalt and recently a TPMS sensor went out. Also, my wife damaged a tire so I am getting them all replaced. I figured I would just get the TPMS sensor replaced at the same time. I am getting them replaced through the dealer. He is charging me $65 for the TPMS sensor installed. I know they are not cheap, but is that at least reasonable? Seems like a lot and they will have the tires off anyways but I have no way to pull tires off to replace one myself. Also, am I being stupid by not changing all 4 at the same time? I guess the answer to that question doesn't really matter since I don't have the extra $185 to do them all now.