The keys have a chip. The DB7 uses the Ford PATS ignition anti-theft system. If you have two working keys you program it to accept a new key. If you do not you will need to have a dealer program the system to recognize the chip in the key. I am not sure if the chips can fail. Anyway, I know this because I recently bought a DB7 that had only one key and had to go through Aston Martin in the UK and an Aston dealer to get additional keys and have them programmed. Good luck!