That makes sense. If they would have explained it to me like that, I wouldnt have second guessed them. Thanks:thumb:They only need to replace the rubber stem, not the actual sensor. Some wheels are not TPMS friendly, the angle of the stem hole could be wrong. If the sensor is positioned incorrectly a low tire or deflated tire could contact it. It also makes mounting the tire more difficult, this is the #1 reason they wont do it.