Is my Ford key reusable?
Reviewed by a NASTF-registered Vehicle Security Professional.
Published · Updated
For most Fords, yes. A key or fob that was programmed to one Ford can usually be programmed to another one. That's not true of every make. Some manufacturers lock the key's chip to the first vehicle it learns, and after that the key only works there. Ford keys don't lock. It holds for Ford's push-to-start fobs, remote head keys, flip keys, and nearly all plain transponder keys.
The reason, as far as the trade can tell, is the chip Ford chose. Ford's keys use Texas Instruments transponders, and a 2015 Locksmith Ledger piece on recycling keys puts those in the "non-locked" group: they "can be recycled and used with a different compatible vehicle." The chips locksmiths don't recycle are GM's and most of Chrysler's.
Which fobs swap with which
On the older fob generations, the 315 MHz and 902 MHz keys, Ford is very forgiving. For the most part you match the frequency and the button layout and the fob will program, even across different FCC IDs. The newer motion-sensing fobs are stricter. Motion sense comes in both 902 MHz and 433 MHz versions, and on a vehicle equipped with it the part number has to match exactly. We don't yet have enough of the non-motion-sense 433 MHz fobs through the shop to say how those behave, so we don't make a claim about them.
The part number and FCC ID are usually printed under the emergency key blade.
Check that the listing includes the electronics. The most common problem we see is a customer who ordered an empty shell online, thinking it was a complete key.
Why does my new Ford key lock and unlock but not start the car?
A Ford remote head key does two jobs. The transponder chip lets the vehicle start, and the remote works the locks. On Ford's own keys both are on one circuit board; they program together and they need a programmer to do it. On most aftermarket keys the chip is separate from the remote board. Ford lets you program the remote buttons yourself from the driver's seat on many models, so a customer with a cut but unprogrammed aftermarket key can run that procedure, hear the locks cycle, and believe the whole key is done. It isn't. The chip still has to be programmed, either with a key programmer or, if you have two working keys, with Ford's own two-key procedure below.
Adding a key when you have two working keys
Ford's rule is the same on every model that allows it: "You must have two previously programmed coded keys and the new unprogrammed key readily accessible." With one key, Ford's answer is the dealer. A locksmith with Ford's software is the other answer.
The procedure depends on the ignition. Here is Ford's, from the 2024 F-150 owner's manual, which uses the same wording as most 2021-and-newer Fords.
Keyed ignition (flip key): "1. Insert the first previously programmed coded key into the ignition. 2. Switch the ignition from off to on. Keep the ignition on for at least three seconds, but no more than 10 seconds. 3. Switch the ignition off and remove the first coded key from the ignition. 4. After three seconds but within 10 seconds of switching the ignition off, insert the second previously coded key into the ignition. 5. Switch the ignition from off to on. Keep the ignition on for at least three seconds, but no more than 10 seconds. 6. Switch the ignition off and remove the second previously programmed coded key from the ignition. 7. After three seconds but within 10 seconds of switching the ignition off and removing the previously programmed coded key, insert the new unprogrammed key into the ignition. 8. Switch the ignition from off to on. Keep the ignition on for at least six seconds until you hear the door locks cycle. 9. Remove the newly programmed coded key from the ignition." Ford adds: "You can program a maximum of six coded remote controls to your vehicle."
Push-button start: the vehicle has a backup slot in the center console for exactly this. "1. Place the first programmed remote in the backup slot inside the center console with your foot off the brake pedal, press and release the push button ignition switch. 2. Wait five seconds and then press and release the push button ignition switch again. 3. Remove the remote control. 4. Within 10 seconds, place a second programmed remote control in the backup slot. Press and release the push button ignition switch. 5. Wait five seconds and then press and release the push button ignition switch again. 6. Remove the remote control. 7. Place the unprogrammed remote in the backup slot and press and release the push button ignition switch." Ford's limit here is four remotes, all doors closed, and the whole sequence inside 30 seconds.
Older keyed Fords use the same idea with slightly different timing. The 2010 Focus manual, for example, holds each key on for one to ten seconds and allows up to eight coded keys. Your own manual has the exact steps under Keys, Security, or Coded Keys.
Some Fords don't allow it at all. Ford's manuals for these say to see a dealer: Explorer 2020–2024, Bronco Sport 2021–2024, Escape 2019 and 2021–2024, Maverick (all years), Mustang Mach-E (all years), Ranger 2019–2023, Lincoln Aviator 2020–2024, and Lincoln Corsair 2021–2022. On those, a new key means a programmer, whether the dealer's or a locksmith's.
Programming the remote buttons yourself
On Fords where the remote and the chip are separate, there's a second procedure that programs only the buttons. It's the one people know as the ignition-cycle trick. Ford's own version, from the E-Series manual: "1. Switch the ignition from off to on 8 times within 10 seconds, finishing in the on position. The doors lock then unlock to confirm that programming has started. 2. Press any button on the remote control that you want to program within 20 seconds. The doors lock then unlock to confirm that programming was successful. 3. Repeat step 2 to program each additional remote control. 4. After you have programmed all remote controls, switch the ignition off." Ford warns that any remote not present during the procedure stops working, and not to touch the brake.
Eight cycles is the count on most Fords from the late 1990s through about 2010, and on the E-Series and Fiesta after that. A few models use a shorter count; the Transit Connect, for instance, uses four cycles within three seconds. Check your own manual for the count; if it isn't there, your Ford is one where the fob is the key and the two-key procedure above is the one to use.
Remember what this procedure does and doesn't do. It programs the buttons. It does not program the chip. If your key was never programmed to start the vehicle, it still won't after this.