I am getting an intermittent tire pressure warning system failure message. The amber low tire pressure light will flash for a few minutes and then stay on constantly, and then go out. A while later, 5 minutes to an hour it will repeat the cycle. I have checked the tires and they are all the same and in specification at 35 psi. I am thinking one of the pressure sensors in the wheels is failing. Is this something I need to go to the dealer for, or can my local tire shop figure this out? I am planning on getting new tires next week.