I bought a spare wheel and had Discount tire INC. mount a tire and thier aftermarket TPM sensor. They work on an off for several weeks trying to get the tmps warning light to go out. The new tire/wheel was on the left front. I finally had to go to Chrysler for a TPS that was special order for two weeks. It fixed the problem. Discount refunded my $ and apologized for not knowing they could re program a Crossfire/Mercedes system to see thier aftermarket piece. Perhaps yor tire shop broke yours and gave you a new replacement.