How to Replace a Dead Mazda 6 Key Fob The Mazda 6 is a beautiful car with a lot of features, among which is an electronic key fob that can lock and unlock the car. The fob, like all other items, can be damaged or worn out. Fortunately, changing the battery on your Mazda 6 key fob is straightforward and affordable. All you require is a flat-head screwdriver and a new CR2025 battery. ...