1. The key does ot contain programming, the PATS system on the Vehicle is where the key code is stored. I am not sure if the Tauras is the same as the F-150s ( 99-03 ) buy the PATS info is stored in the HEC ( the circuit bs behind the gauges ).
If you don't have another key to try, you can always try for a locksmith that does PATS key work. They would have the NGS replacement, for erasing all the keys and reprogramming new ones.
Thing is, if the HEC ( or where ever it is sotred on the Tauras ) programming is fine, but you are having a problem with say the PATS tranciever ( the antenna that "paints" the key to read the code ) then the locksmith is not going to be able to get past the erasing part, just prior to adding in the first 2 keys ( the programming steps after erase all ).
Few questions :
1. Do you have a remote start ?
1.1. If so, what brand, and how is the PATS bypass done ?
2. Have you done any work in the pass comaprtment of the car ?
2.1. i.e. work around the steering column, or under the dash, like stero work ?
3. Do you have at least one other key to try with ?
3.1. Hope you have at least 3 keys, as you need 2 to add a key to the system.