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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 explain everything you must learn about the process of adding, changing, and programming your Mazda 3 key fobs. Be aware that some keys require programming by an expert locksmith, while others don't. Use only official Mazda replacements to replace your key fob. How to add a spare key You can add another key in the event that you don't have a spare key available or when you accidentally damage your existing one. You'll need an flat-head screwdriver and a new CR2025 battery. Once you've got these items you can remove the key fob and change the battery. First look for the key release button for the auxiliary key. It's located under the metal piece and is easy to locate. When you hit the button, the cover will fall off instantly. Then, you can insert the screwdriver's head into the notch or spacing at the top of the metal part and pull it off. Insert your spare or new key into the slot after you have removed the auxiliary key. Switch the ignition on and then wait for around five seconds, then turn it to off. This will register the new key's details to the system which will allow it to start your car in the future. It is only possible to program three keys to your Mazda 3. The one thing you don't want is to have more than two functioning key fobs but not be able to get your car started. This is a safety precaution designed to prevent unauthorised users, like valet drivers who are not authorized to use your key and starting your vehicle. How to Reprogram a spare key If you have a spare key it's important to be aware of how to reprogram it in the event that your original key is lost or stolen. This will stop unauthorized persons from opening your car or stealing it. This will work with any Mazda. You will need two keys that are working for the reprogramming to begin. If you don't have the two working keys, you'll need bring your vehicle to the dealership to get it done. Start by getting into the driver's position and close all the doors with the exception of the one that is open. Insert the first working key in the slot, then set the ignition to ON. Wait five seconds before removing the key. Repeat with the second key. Once you've completed programming your new key you should have 3 keys that will start your car in the future. Before placing each key in storage, make sure that it's working correctly. It's a good idea purchase a spare Mazda 3 key fob, especially if you're a driver who often loses your key or has other issues with it. You can purchase one online or at a local automotive store, but be sure to read the reviews before buying so that you aren't buying a key fob that's not compatible with your vehicle. How do I change the battery on a spare Key There's nothing more frustrating than finding that the battery for your key fob has died and you can't unlock your vehicle. Fortunately, it's easy to replace the battery and save yourself some money at the dealership. The first step is to press the auxiliary key button located on the back of the key fob. This will take out the key's metal cover and reveal an opening on each side of the case. Press the flathead screwdriver into one of these slots and then gently break the two sides of the case. Once the battery is fully exposed, take it out and place the case somewhere that you won't forget about it. Make sure you have a replacement battery before you start. They can be found at any store that stocks batteries or at a Mazda dealer close to Winter Garden. Choosing the correct battery will ensure that your key fob operates correctly. Next, put the new battery in its place and then replace the battery cap. Be careful not to damage the small rubber ring the battery sits on. 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 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 have it stolen the car won't start even if you've got the spare fob. This is because the key fob needs to be reprogrammed by the dealership to function properly. It can be a costly and stressful experience and it's a good idea to know how to reset the system yourself. To reset the system, disconnect the battery for around 15 minutes. This will take out any remaining electricity from the onboard computer. Next, disconnect both the LF-ECU connector and the demand switch connectors. Check Read A lot more between the following terminals. To program an entirely new key or spare, place it in the slot and turn the ignition to ON. Keep the key in place for around five seconds and then turn it off. The key's information will be transferred to your vehicle's computer and the new fob will be able to start your car in the future. You can program up to three fobs, but you must only use one at each time. This will prevent unauthorized persons from copying your key and gaining access to your vehicle. You can purchase a replacement key fob online, but you'll still have to visit a locksmith or dealer in order to cut it and programmed.