1. Standard Key (No Transponder Chip):
* Obtain a new key blank: You can find these at most auto parts stores (like AutoZone, Advance Auto Parts, or NAPA) or locksmiths. You'll need to provide the year, make, and model of your vehicle, or better yet, bring the old key for them to match.
* Have the key cut: Take the blank key to an auto parts store that offers key cutting services, or a locksmith. They'll cut the new key to match your existing lock's profile.
2. Key with Transponder Chip (Most likely):
A 1998 Ford Expedition almost certainly uses a key with a transponder chip embedded in the head. This chip communicates with the vehicle's immobilizer system to allow the engine to start. Simply cutting a new key won't work. You have several options:
* Dealership: The dealership is the most expensive option, but it's generally the most reliable. They'll program a new key for your vehicle using their diagnostic equipment.
* Locksmith: Many locksmiths are equipped to program transponder keys for Ford vehicles. This is often a more affordable option than the dealership. Make sure you choose a locksmith who explicitly states they can program keys for Ford vehicles of that year.
* Auto parts store (Some locations): Some larger auto parts stores offer key programming services, but this isn't as common as locksmith services. Check with your local store to see if they offer this. If they do, they'll need your vehicle's VIN.
Before you start (either method):
* Locate your key code: If possible, find the key code for your vehicle. This can sometimes be found on a sticker inside the glove compartment or in your owner's manual. It will help in getting the correct key cut.
Important Considerations for Transponder Keys:
* Number of Keys: It's best to have all your keys present for programming, as some systems require them to be programmed together. Programming a new key may overwrite the existing ones.
* Cost: Programming a transponder key is significantly more expensive than cutting a standard key.
* Vehicle Immobilizer: If you lose all keys with transponder chips, you'll likely need the dealership's help.
In short: For a 1998 Ford Expedition, the chances of needing a transponder key are extremely high. Avoid the DIY approach with transponder keys unless you have extensive automotive experience and proper equipment. A locksmith or dealership is the recommended route.
