Carrier/rack problems of the 2008 Dodge Ram 1500

The tire pressure monitoring system (tpms) light began flashing indicating an problem with the system. After checking the tire pressure in all four tires and finding them to be normal I went about my driving activities. While approaching a stop light the back passenger side dipped down and I could hear the sound of a flat tiring flopping about. The tire went from perfectly fine to flat instantly. Fortunately I was traveling at a low speed and could stop safely. While changing the tire I noticed the valve was missing. Taking the tire into a local shop the mechanic handed my the tpms sensor and told me it had fallen in, taking the valve stem with it. The sensor fell in because the retaining nut had corroded and broken off. In April 2013 the front passenger side tpms nut cracked and caused that tire to slowly go flat. I was traveling on the interstate when the system indicated a tire problem. I pulled off and checked the tire pressure, all normal. I continued on my journey to a state highway. Once going down the highway I started to get some wobble and flat tire sounds. Pulled over and the tire was almost flat. As I was changing this tire the retaining nut broke and the sensor fell into the tire. I experienced two tire problems because of the tire pressure monitoring system sensor nuts were corroded.