So I had my wheels and tires mounted by discount tire. During the process the guy dropped one of my sensors on the ground. Well they continued to mount them and sure enough I have a light on the dash. It flashes for a minute then stays on. I read in the manual that if it flashes then theres a malfunction. My question is can I find out which sensor is bad without the dealer? I have an 07 SE KC. I went back to discount tire and told them they have to pay for it. They had some handheld scanner and went to each sensor and said they were all registering. How do I know which one is bad?