Trouble programming transponder key 2002 ford taurus sel
My dad has an 02 ford taurus sel and both my parents have a key for it. I just got my license and I figured I'd be driving his car alot, so I order a transponder key on ebay. I followed all the programming instructions in the manual, and the car starts, but the manual says the theft light shuts off after three seconds, and for me, the light never shut off. After it starts the one time, the car wont start again with that key. yet, if i repeat the process, the car starts, but again only the one time. Does anyone have any idea what is going on or how I can get my key to work?
Your replies ar greatly appreciated :)