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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea to keep an extra key at hand in case you lose your keyfob, or it stopped working. This article will tell you how to add, alter and re-programme your Mazda 3 keyfobs. A word of caution Some keys require programming by a locksmith professional or dealer, while other keys don't. Make sure to use official Mazda replacements for your key fob. How do I add a spare key? If you're not fortunate enough to receive a spare keys from the dealer when you purchase your Mazda 3 or accidentally break the one you have Don't fret, there's a way to add another key. To accomplish this, you'll need a small screwdriver with a flat head and an updated CR2025 battery. Once you've got the tools, it is time to open the key fob. First find the button that allows you to release the key. It's on the underside of the metal component and is easy to find. When you press the button, the back cover should fall off right away. Then, you can insert the screwdriver's head into the notch or space at the top of the metal part and pull it off. Insert your new or spare key into the slot after removing the auxiliary key. Set the ignition to ON and wait for about five seconds before setting it to off. This will allow the system to recognize the new key and begin your vehicle in the future. It is only possible to program three keys on your Mazda 3. The one thing you don't want is to have more than two functioning key fobs, and not be in a position to get your car started. This is a safety measure to prevent unauthorized users from activating your keys and starting your vehicle. How to Reprogram a Spare Key If you have a spare key it's best to be aware of how to program it in the event your original key is lost or stolen. This will stop unauthorised people from opening your car or stealing it. This procedure should work with any Mazda however, you'll require two keys working to begin the reprogramming. If you don't have the two working keys, you'll need to bring your vehicle to the dealership to have it done. Start by stepping into the driver's position and shutting all doors, with the exception of the one that is open. Insert the first working key in the slot, and then turn the ignition to ON. For five seconds, take the key out and repeat the process with a second working key. After you've programmed your new key you should have 3 keys that work to start your car in the near future. Before storing each key, make sure it's functioning correctly. You should think about buying a spare Mazda 3 remote, especially if your car is prone to problems. It's possible to find one on the internet or at your local auto store, but make sure to read reviews prior to purchasing so you aren't buying an item that isn't compatible with your vehicle. How to change the Battery on a spare key There's nothing worse than finding that the battery for your key fob has been damaged and you're unable to unlock your car. It's not a problem to replace the battery and save some cash at the dealership. Press the auxiliary key button at the back of the keyfob. This will release the metal key and reveal the slots on both sides of the case. Press the flathead into one of these slots and then gently pull the two halves apart. After the battery is fully exposed, take it out of the case and place it somewhere you will not forget it. Before you begin, make sure that you have a new replacement battery. These batteries can be purchased from any store that sells batteries or from a Mazda dealer in Winter Garden. Choosing the right battery will ensure that your key fob works perfectly. Replace the cap of the battery and then replace the battery. Be careful not damage the rubber ring on which the battery rests. Finally press the two halves of the key fob together until you hear the sound of clicking. How to Reset a Keyless Entry System The Mazda 3 key fob is not just a convenience. It also serves as an element of security. If you lose your key or have it stolen, the car will not start, even if you have the spare key fob. This is because the fob that you have to be reset at the dealership in order to function properly. This can be an expensive and stressful experience, so it's a good idea to learn how to reset the system yourself. Remove the battery from the system for 15 minutes. This will clear any residual electricity from the on-board computer. Next, disconnect mazda keys locked in car LF-ECU and demand switch connectors. Then, verify the continuity between the following terminals: Place the key into the slot, and turn the ignition ON. Stop the ignition after approximately five seconds. The key's details are now stored in the car's computer and the new fob will start your car. You can program as many fobs as you would like however only one should be in use at any particular time. This will prevent unauthorised people from stealing your key and gaining access to your car. You can buy a new key fob online, however you'll need to visit a locksmith or dealer in order to have it cut and programmed.