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How to Add, Change, and Reprogram a Mazda 3 Spare Key Whether you dropped your key fob on the ground or it simply stopped working, it's recommended to keep an extra key available. This article will show you how to add, change or reprogramme the Mazda 3 keyfobs. Note: Some keys require programming from a professional locksmith, while others do not. Use only official Mazda replacements to replace your key fob. How to add an extra key You can add an additional key if you don't have a spare key available or if you accidentally break the one you have. You'll need a flathead screwdriver, and a new CR2025 battery. Once you have these items then it's time to remove the key fob and replace the battery. Locate the key release auxiliary. The button is beneath the metal portion. It's easy to find. The cover that covers the back should come off the moment you press the button. Then, you can insert the screwdriver head into the notch on top or in the space, and pull the metal piece off. Insert your spare or new key into the slot after removing the additional key. Set the ignition to ON, and wait about five seconds before setting it to off. This will register the new key's details to the system which will allow it to start your vehicle in the future. It's important to note that you can only program up to three keys on your Mazda 3. You don't want to have to use more than two key fobs to start your vehicle. This is a safeguard to stop anyone who is not authorized from activating your keys and launching your vehicle. How do you reprogram an unrepaired key If you have a spare key, it's a good idea know how to program it in the event your original key gets lost or stolen. This will stop unauthorised people from starting your car, or taking it. This will work with any Mazda. You will require two keys that are functioning for the reprogramming to begin. If you don't own two keys that function, it's best to take your Mazda to a dealer to get this completed. Start by stepping into driver's position and close all the doors, except the one that is open. Turn the ignition on and then insert the first working key. For five seconds, take the key out and repeat with the second working key. After you finish programming your new key you should have 3 keys that will start your vehicle in the future. Test each key to make sure that they're working properly before putting them away. It's a good idea buy a spare Mazda 3 key fob, especially if your car is one who frequently loses their key or has other issues with it. You can purchase one online or at your local auto store. Make sure to read reviews before purchasing to ensure you don't buy a key fob which isn't compatible with your vehicle. How to Change the Battery on a Spare Key There's nothing more frustrating than finding that your key fob battery has failed and you are unable to unlock your car. Fortunately, it's easy to replace the battery and save some cash at the dealership. The first step is to press the auxiliary button on the back of the key fob. This will release the metal key auxiliary and reveal a slot on both sides of the case. Insert the flathead screwdriver into one of these slots and gently take apart the two halves of the case. Once G28 is fully exposed, remove it and place the case somewhere safe from being lost. Before you begin, make sure that you have a new replacement battery. They can be found at any store that stocks batteries or at a Mazda dealer near Winter Garden. The right kind of battery is crucial to ensure that your keyfob works properly. Replace the battery cap and then put in the new battery. Be careful not damage the rubber ring on which the battery rests. The two halves should be pressed together until you hear the click. How can I reset the Keyless Entry System The key fob inside your Mazda 3 is not only an option for convenience, it's an important security feature. If you lose your key or had it stolen the car won't start even if you've got the spare key fob. This is because the fob that you have to be reprogrammed at the dealership in order to function properly. This can be a painful and costly experience. Therefore, it's advisable to learn how you can reset the system. To reset the system, disconnect the battery for approximately 15 minutes. This will eliminate any remaining electricity from the onboard computer. The next step is to disconnect the LF-ECU and demand switch connectors. Verify the continuity between the next terminals. Place the key into the slot, then turn the ignition ON. The key should remain in the ignition for around five seconds and then turn off. The key's details are now transferred to the computer of your vehicle and the new fob will start your vehicle. You can program as many fobs as you would like but only one can be used at a given time. This will prevent unauthorized people from stealing your keys and gaining access to your vehicle. You can purchase a new key fob on the internet, but you'll still need to go to an authorized locksmith or dealer to cut it and programmed.