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Whoever put on your tires or last balanced your tires, broke the belt that keeps the sensor on the rim. Spin your wheel to see if any broken parts. Take it back to the tire store not the dealer.
Chris, what dealer do you use? I go to Sayville Ford and they know my car has a tune, so if they have to reflash it for any reason they tell me to put it back to the stock tune before they do anything. The only time I have to put it back to stock is for an inspection, for some reason it wont pass if I leave the custom tune on.