August '08-'09 Buildoff 2007 Ford Mustang GT

did you try airing up your tires and making sure they are all even? your sensors monitor your pressure and when they get low, of course pop on. sometimes if they are not all even it can trigger a code too. air them all up a couple pounds over factory specs, make sure they are even, reset your ecu, and see if it goes off. if not, then yeah hit the dealer.