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Make sure you have an extra set Mazda Premacy Key of keys that work before having yours replaced. Mazda key Programming cost To do this, mazda key cut 3 mazda key replacement cost uk replacement (community.windy.com) take off the battery cover on the Mazda Premacy Key fob. Place the mazda spare key battery in such a Mazda Premacy Key way that the positive (+) side is facing upwards.