I tried to get a key cut at Walmart and they couldn't do it-they didn't have the right shaped key. The Infiniti dealer said the keys had to come from the dealership. There is a computer chip in the key that communicates with the ignition and computer, and they all must mesh together. If you had the correct shaped key and tried to use it without first setting the computer, the theft deterent functions would shut down the car and none of the original keys would work. Your car would be dead in the water until reset by the dealer. A full functioning key is $129. A valet key(that also has the radio chip), that allows starting the car, but will not open the glove compartment or trunk is $109. A door key (without the radio chip)that will not start the car is $9. All these prices are from Grubbs Infiniti in TX. I don't know what a replacement fob costs.
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