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How to Add, Change, and Reprogram a Mazda 3 Spare Key Whether you dropped your key fob on the floor or it has stopped working, it's a good idea to have a spare key handy. mazda 3 key will go over everything you need to know about adding, changing, and programming your Mazda 3 key fobs. Be aware that some keys require programming by an experienced locksmith, whereas others don't. Make sure you use only authentic Mazda replacements to replace your key fob. How to add a spare key If you're not fortunate enough to receive a spare keys from the dealership when you purchase your Mazda 3 or accidentally break the one you have Don't fret, there is still the option of adding another key. To accomplish this, you'll require a small flathead screwdriver and the new CR2025 batteries. Once you have these items, it's time to open up the key fob to change the battery. Find the auxiliary key release. It's located under the metal component and is easy to locate. When you press the button, the back cover should slide off immediately. Then, insert the screwdriver's tip into the notch at the top or the space, and pry the metal part off. After the auxiliary key has been removed, insert the new or spare key into the slot. Set the ignition to ON, and wait about five seconds before turning it to OFF. This will add the new information on the key to the system that will allow it to start your car in the future. You can only program three keys on your Mazda 3. You don't want to utilize more than two key fobs to start your car. This is a security measure designed to prevent unauthorized users, like valet drivers from activating your key and starting your car. How do I reprogram an unrepaired key If you have a spare key it's important to know how to program it if your original key gets lost or stolen. This will keep unauthorized people from taking your car and then starting it. This process should work on any Mazda, though you'll need two keys working to begin the process of reprogramming. If you don't have two functioning keys, you'll need take your vehicle to a dealership to get it done. Start by getting into the driver's seat and shutting all doors, with the exception of the one that is open. Turn the ignition on and insert the first functioning key. After five seconds, take the key out and repeat with the second key. After you've completed programming your new key, you'll have three working keys that you can use to start your vehicle in the future. Test each key to make sure that they're working properly before throwing them away. It is advisable to purchase an extra Mazda 3 remote, especially in the event that your vehicle is prone to issues. You can purchase one online or at your local auto store. Be sure to go through reviews prior to purchasing so that you don't get a key fob which isn't compatible with your car. How to change the battery with a spare key? There's nothing more frustrating than finding that the battery on your key fob gone out and you're not able to unlock your car. Luckily, it's easy to replace the battery and save yourself some cash 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 metal key 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 parts of the case. Once the battery is fully exposed, remove it and put it away somewhere you won't forget it. Be sure to bring an additional battery prior to starting. These batteries can be purchased at any store that sells batteries or from a Mazda dealer in Winter Garden. Using the right type of battery will ensure that your key fob operates properly. Next, put the new battery in its place and then replace the battery cap. Be careful not to damage the rubber ring that holds the battery. Then press the two halves of the key fob until you hear an audible click. How to Reset the Keyless Entry System The key fob on your Mazda 3 is not only an extra convenience, but also an important security feature. If you lose your key, or have it stolen the car will not start, even if you have the spare fob. The key fob needs to be reprogrammed by the dealer to enable it to function again. It can be a stressful and expensive ordeal. Therefore, it's advisable to know how to reset the system. Remove the battery from the system for 15 minutes. This will eliminate any residual electricity from the on-board computer. Then, disconnect both the connectors for the LF-ECU and the demand switch connectors. Then, verify the continuity between the following terminals: Place the key into the slot, then turn on the ignition. Keep the key in place for about five seconds and then turn it off. The key's information will be added to the vehicle's computer, and the new fob will be able start your car in the future. You can program as many fobs you desire however only one should be utilized at any particular time. This will stop unauthorized individuals from stealing your key and gaining access to your car. You can buy a new key fob online, but you'll still have to visit a locksmith or dealer in order to get it cut and programmed.