Tire Pressure Monitoring System problems of the 2007 Ford Mustang

My left rear tire lost air while driving down the highway. After several attempts to put keep air in the tire I realized it was the valve stem. I put air in, would hold air when stopped and at highway speed would go flat again. I changed that valve stem, four days later the same thing happened with the left front. This time I checked the others, in the end, all four valve stems were cracked and two failed allowing the tire to lose all air and go flat. I have goodyear f1 supercar tires and 15,800 miles on the car. The valve stem is the ti 414,.

Low tire pressure sensor comes on after a couple of weeks of airing up tires I took to Ford who said tires where overinflated so the set it back to the correct air pressure only to get the light back on in a week . This is a serious problem because tires can be over inflated which could cause the tire to explode or cause extremely quick tire wear. {either by over inflating or the low tire pressure} these tires are over inflated only to keep the tire pressure light from coming back on. I also brought up to Ford service dept. About the valve stem issue I read , but the looked at me like I was crazy . Nobody there heard of that . I am just 1 person but I have a small child and don't want this issue to cause a serious accident thank you.

My 2007 Ford Mustang was shipped without tire air pressure sensors. When I took it to the dealer they wanted me to pay for sensors.

Tire valve stems cracking on new car, only 7 months old and all 4 tire valves where cracked. No accident happened and Ford replaced all 4. These are not the same that have been recalled recently. The car has the tire pressure monitoring system with special valves.