KDawg
I just went through this with my 08. Once I found out that if the tire company or whoever was messing with the sensors, broke one, it is not covered on warranty, I decided not to touch the sensors. And yes they are pricey.
I took the factory wheels off the truck (with sensors) and put on a set of inexpensive chrome wheels and winter tires for the winter.
No one at the Ford dealership seemed to know how the TPMS would react. Well to make a long story short, the TPMS warning light comes and goes with ignition cycles. In my case, about every 2 weeks my warning light comes on for 2-3 days (blinks a few times at start up, then stays on).It then shuts off for about 2 weeks. My guess is the ignition cycles clear the warning after so many starts.
Hope this helps.