Transponder vs. Smart Key vs. Laser-Cut Key: Which Do You Have?
By Mega Lock And Key · MD Locksmith License #394 ·
You can usually tell your car key type by looking at it: a plain metal key has no plastic head, a transponder key has a plastic head with a chip, a laser-cut key has a groove milled down the middle of the blade, a flip key folds into a remote, and a smart key is a fob with no blade needed to start the car.
Plain metal key
All metal, no plastic head. Common on older cars. It only has to be cut, not programmed.
Transponder key
A metal blade with a plastic head. Inside the head is a chip the car reads before it lets the engine run. A copy that is only cut will open the doors but will not start the car; it has to be programmed too. Ford calls its system PATS; GM used Passlock and Passkey; Toyota, Honda, and Nissan have their own immobilizers.
Laser-cut (high-security) key
Instead of notches on the edges, a wavy groove is milled into the flat of the blade. It needs a dedicated machine to cut. Many Toyotas, Lexus models, Hondas, Acuras, Volkswagens, and Audis use laser-cut blades, often combined with a transponder.
Remote head or flip key
The transponder and the lock buttons share one head; on a flip key the blade folds in. Both the remote and the chip have to be programmed.
Smart key (proximity fob)
Used on push-button-start cars. The car detects the fob nearby; there is usually an emergency blade hidden inside. Names vary: Honda Smart Entry, Toyota Smart Key, Nissan Intelligent Key, Ford Intelligent Access, BMW Comfort Access, Mercedes-Benz Keyless-Go, Chrysler Keyless Enter-N-Go.
Why it matters
The key type decides what replacement takes: cut only, cut and program, or program only. When you call, the year, make, and model tell us which one you have. See our car locksmith service and the page for Toyota, Honda, or Ford keys for make-specific detail.