Most cars come with 2 sets of keys............ where's the other set? If you don't have another set of keys, try writing down the serial number of the car (you can find it at the bottom of the windshield on the drivers side) Carefully write down the whole number ( it will be about 15-20 numbers and letters ) Take the number to a Mazda dealer......... they might be able to make keys for it by using that number.