Plain metal key
A cut blade and nothing else. Common before the late 1990s. Any key that fits will start the car, which is why they were replaced.
Transponder key
Looks like a metal key with a thick plastic head. Inside the head is a chip. When you turn the key, the car checks the chip and only then allows the engine to run. A copy without a programmed chip opens the door but will not start the car.
Remote head key and flip key
A transponder key with lock, unlock and trunk buttons in the head. On a flip key the blade folds into the fob. Two things need programming: the chip to start the car and the remote to work the locks.
Smart key
A fob with no blade showing. The car senses it nearby and lets you start with a button. There is an emergency blade hidden inside for the door.
Key card and phone key
Some electric and newer vehicles use a card or a phone app in place of a key. These are set up through the car or the maker, not cut by a locksmith.
How to tell what you have
- Push-button start: smart key.
- Buttons on the key head: remote head or flip key.
- Thick plastic head, no buttons, car newer than about 2000: almost certainly a transponder.
Related: car key replacement, car key programming, key fob replacement.
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