Three functions worth separating.
The metal blade operates a mechanical lock. An electronic chip may authorize starting. Remote buttons send commands such as unlocking the doors. Some keys combine these functions in one case; that doesn't make cutting and programming the same job.
A spare changes the starting point.
If you have one key that reliably starts the car, say so. When all working keys are gone, additional work or parts may be involved. Replacement without the original is possible for many vehicles, but needs checking for yours.
Check the part before ordering it.
A matching button layout isn't enough to confirm compatibility. If you bought a fob online, keep the listing and packaging and ask whether it can be used. Some parts may be unsuitable or need a different process.
Compare a complete result.
Ask which functions, cutting and programming are included. Check any travel or other charges as part of the quote. Our guide to a lost car key explains the information that makes those options easier to compare.
Key designs vary by vehicleThe cut blade works a compatible mechanical lock. A blade that fits is only one part of many modern car keys.
Inside the fob, a chip may need to be recognized before the car will start. Programming depends on the vehicle and key.
Remote buttons handle functions such as locking and unlocking. A matching case does not establish compatibility.
A couple of common questions.
Will every replacement need programming?
Key systems vary. A plain mechanical key and an electronic key are different, so confirm what the specific vehicle requires.
Is the locksmith option always cheaper?
No. Compare the same part and functions, including any extra travel or towing involved. An old online example isn't a quote for your car.