Tire Sensors on my 2007 Endeavor
 

I kept getting a "low tire" light on my dash and thought I had a bad tire so I took it to the tire store and they showed me that the valve stem was leaking. Had to replace the tire sensor since it broke when they removed the valve stem. Anyway, cost of $200---and the tire light will not go out. They keep telling me it will reset, but has not happened. Is it because it is an aftermarket sensor?
What is the solution?