OK . . . I just swapped out the transponder chip, and the key blade into my "almost new" OEM key fob that I received from that E-Bay seller. I did the "snyc" procedure and everything worked perfectly. It starts the car and all the key fob function work as they should. I believe (in harmony with what onehundred80 just related) that the "new" key fob will only sync up to the car if the transponder chip installed is the correct matching one for the car. Anyway, I enjoyed a successful result from my $9.99 key fob purchase.