I have read via Google that they do, however I can personally attest that mine does not.
In 1999 it may or may not have one. If it has a thick black head with the hole in the head of the key being offset, then it is probably a chip key. If the hole is in the center top of the key or completely metal then it is not a chip key.
A key is needed to enter, lock, and unlock many Mercury Sable cars. A key is also needed to start the engine.
Most 2000 Concordes do have chip keys.
If it has a cover on the key, yes. If it is a steel key no.
look in the glove box
no, its not a laser key either
Maybe the chip in the key is defective.
Amazingkeys.com has the 2000 Buick LeSabre Key. It does have the chip in it.
The immobilizer.
yes
The 2000 Ford Taurus does contain a transponder chip inside the key. The replacement can be programed by a locksmith or dealer service department.
I believe that wire is for the key is in the ignition warning buzzer! Not 100%, but 90%.