The 1999 Ford Expedition comes standard with a passive anti-theft system Ford calls "PATS," that incorporates a computer chip-equipped key to cut down on vehicle theft. Ford codes the chip inside the key with a digital signal unique to the particular Expedition. A transponder inside the dashboard reads and recognizes this signal as soon as you insert the key into the ignition. If the chipped key is not present, the Expedition's ignition system is disabled. In the event you lose or damage your key, you'll need to have a Ford dealership replace it and program the replacement key to your Expedition.
Go to your Ford dealer's parts department with your 1999 Expedition's VIN number, registration or title and your state issued ID.
Present your VIN number to the parts counterperson and request a new key for your 1999 Ford Expedition. The Parts Manager will need to verify you own the Expedition by matching your title or registration with your state issued ID (if the Parts Manager is not available, ask to see the Service Manager or Parts and Service Director). This is a safety measure incorporated by Ford Motor Company in 2007 to prevent thieves from requesting keys to your Ford vehicle.
Go to the service department with your new key and request to have the key programmed to your Expedition. You will have to have your Expedition present, so if you don't have any keys for it, you'll need to tow it to the dealership.
