Onboard vs tool programming
Older onboard procedures use a sequence with the ignition and existing keys. Those only work if the vehicle still has a working programmed key and the procedure is still supported.
Most current work uses a diagnostic tool connected to the OBD port. That is how add-a-key and all-keys-lost programming is done on a lot of domestic and Asian vehicles we see around Downriver.
Some vehicles require online security access or a brand-specific interface. That is usually dealer territory.
Add-a-key is not the same as all keys lost
If you still have one working key, adding a second is typically faster and more straightforward. The module already trusts an existing transponder.
If none remain, the module has to be taught from scratch. That takes different steps and, on some vehicles, different equipment.
Questions people actually ask
I bought a key on the internet. Can you program it?
Sometimes. Aftermarket fobs and chips are inconsistent. If the part is the wrong frequency, the wrong board, or a clone the vehicle will reject, programming will not save it. We would rather quote a known-good part than chase a $20 fob for an hour.
Related work
Served from Taylor
Based in Taylor, City Locksmith Taylor provides mobile service throughout Downriver and nearby communities. Taylor neighborhoods we cover, then the rest of Downriver:
From the truck
Verified jobs related to this service.
Job case study
2017 Ford F-250 key duplication and programming
The F-250 needed a spare flip key. A working original was available, so this was add-a-key, not all keys lost.
See the job
Job case study · July 2026
Chevrolet Malibu push-to-start fob programmed
The Malibu needed a programmed proximity fob in Taylor — push-to-start, not a metal-key copy.
See the job