i don't no if you will understand but i will try my best, i just recently purchased a car and the previous owner gave me a key that looked like a copy and did not have the chip that most keys come with{the plastic piece where the chip is on top of the key its usually black} but when ever i use the duplicated key it works fine.....if there was an alarm will the car not even turn on or do i have to take it to a dealer and make a key with a chip in it? sorry for the confusion