The computer stays in a high security mode until two keys are used. The reason they do this is so that someone doesn't "borrow" your keys and try to make a key for your car. They would have to borrow both sets to program their key, which is less likely to happen. Also its to keep someone from reflashing your computer, but if you get a key why the hell would you need to re-flash it to drive it? But of course this is just BS to me, for Ford to get some money outta ya.
I'm sure Ford could have reflashed without the second key, but its probably not their SOP.
Quality Engineer (Electronics) for Kia Motors
University of Tennessee Electrical Engineering Graduate
2000 XLT 2.5L A/T