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The immobilizer.
It could. A gray key does have a chip, a black key does not.
Yes
Yes
Nope!!!
Yes.
No there is no chip in the key however the ignition lock cylinder does enable and disable the theft system.
Yes it does.
If the key head is gray, yes. If the key head is black, no.
Yes, the 2002 Pontiac Grand Am GT key typically contains a transponder chip. This chip is part of the vehicle's anti-theft system and communicates with the ignition to allow the engine to start. If the key does not have the correct chip or if it is not recognized, the vehicle will not start. It's important to use a properly programmed key for optimal functionality.
Yes, it has a chip. You can take the key to the Walmart auto section where they make keys. They can test it and tell you if it for sure has a chip but I am 99% sure it does.
It could, the sentry key system was optional on a 2002 Chrysler Town and Country.