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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea always to have an extra key in your pocket regardless of whether you lost the keyfob you were using or it stopped working. This article will cover everything you must learn about the process of adding, changing, and programming your Mazda 3 key fobs. A word of warning Certain keys need to be programmed by a professional locksmith or dealer, whereas others do not. Make sure you use only genuine Mazda replacements to replace 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 your current one, don't worry — there's an option to make another key. To accomplish this, you'll need a small flathead screwdriver and a new CR2025 battery. Once you have these items and are ready to open up the key fob and replace the battery. First, locate the button that allows you to release the key. The button is located beneath the metal part. It's easy to find. The cover on the back should fall off when you press the button. Next, insert the screwdriver's head into the notch, or the spacing at the top of the metal piece and pry it off. After the auxiliary keys are removed, insert your new or spare key into the slot. Set the ignition to ON and wait about five seconds before setting it to off. This will add the new information on the key to the system that will allow it to start your vehicle in the future. It's important to know that you can only program up to three keys on your Mazda 3. You don't want to use more than two keys to start your car. This is a security precaution that is designed to block unauthorized users, like valet drivers who are not authorized to use your key and thereby starting your car. How do you reprogram an unrepaired key? It's a smart idea to know how you can reprogram an extra key in the event that your original key gets lost or stolen. This will stop unauthorized persons from getting into your car and causing damage to it. This will work with any Mazda. You will need two keys that work to start the reprogramming process. If you don't have two working keys, you'll need take your vehicle to the dealer to get it done. Begin by getting in your driver's seat and closing the door, except for the one that's opened. Put the first working key into the slot, and then set the ignition to the ON position. Wait for five seconds, then take the key out and repeat the process with the second working key. After you finish programming your new key, you should have three keys that will allow you to start your vehicle in the future. Before saving each key, be sure that it's functioning properly. You should think about buying a spare Mazda 3 remote, especially in cases where your car is prone to problems. You can buy one online or at a local automotive store. Make sure to review the reviews before buying to ensure that you don't get an item that isn't compatible with your vehicle. How do you change the battery on a spare key There's nothing more frustrating than finding that the battery in your key fob has failed and you are unable to unlock your vehicle. It's a good thing that it's simple 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 take out the metal key auxiliary to reveal two slots on the sides of the case. Put the flathead screwdriver in one of these slots. Then, gently break the two halves of the case. When the battery is fully exposed, take it out of the case and place it somewhere that you will not forget it. Be sure to have a new battery ready prior to beginning. These batteries can be purchased at any store selling batteries or from a Mazda dealer in Winter Garden. Choosing the right battery will ensure that your key fob is working perfectly. Then, place the new battery in place and replace the battery cap. Be careful not damage the rubber ring on which the battery rests. Press the two halves together until you hear the click. How to Reset a Keyless Entry System The key fob in your Mazda 3 is not only an option for convenience, it's an important security feature. The car won't start if your key is lost or stolen, even if you've got an extra fob. This is because the fob that you have to be reset at the dealership to work properly. This can be a painful and expensive ordeal. Therefore, it's recommended to learn how you can reset the system. Remove the battery from the system for 15 minutes. This will erase any residual electrical current from the computer on board. Then, disconnect both LF-ECU connector and the demand switch connectors. After reference , test for continuity between the following terminals: To program the new key or spare, insert it into the slot and set the ignition to ON. Leave the key in for about five seconds, then switch off. The key's information has been added to the vehicle's computer and the new fob can start your car. You can program up to three fobs, but you must only use one at each time. This will prevent unauthorised people from stealing your keys and getting access to your vehicle. You can buy a new keyfob from the internet, however it'll still need to be cut and programmed by a dealer.