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How to Add, mazda key fob battery , and Reprogram a Mazda 3 Spare Key It's a good idea always to keep an extra key on hand regardless of whether you lost your keyfob or it stopped working. This article will explain how to add, change or reprogramme the Mazda 3 keyfobs. Note: Some keys require programming from an expert locksmith, while others don't. Be sure to only use genuine Mazda replacements for your key fob. How to add a spare key If you're not lucky enough to receive a spare keys from the dealership when you buy your Mazda 3 or accidentally break your current key but don't worry, there's the option of adding another key. You'll need to use a flathead screwdriver, and a CR2025 new battery. Once you have the items you need, it's time to open the key fob. Locate the key release auxiliary. It's located on the underside of the metal portion and is easy to locate. Once you hit the button, the cover should fall off right away. Then, place the screwdriver's tip into the notch on top or in the space, and pull the metal piece off. After the auxiliary key has been removed, insert the new or spare key into the slot. Switch the ignition on and wait for five seconds, and then turn 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 in your Mazda 3. The one thing you don't want is to have more than two working key fobs and not being in a position to get your car started. This is a precautionary measure to stop unauthorized users from activating your key fobs and starting your car. How do I reprogram an unrepaired key It's a good idea to learn how you can reprogram a spare key in the event that the original key is lost or stolen. This will prevent unauthorised persons from abusing your vehicle and re-starting it. This will work with any Mazda. You'll need two keys that are functioning to begin the reprogramming. If you don't have two working keys, you'll need to bring your vehicle to the dealership to get it done. Begin by getting in your driver's seat, and close the door, except for the one that's open. Place the working key in the slot, then set the ignition to the ON position. Wait for five seconds, then take the key out and repeat the procedure with the second working key. Once you've finished programming your new key, you should have three working keys you can use to start your vehicle in the future. Before you store each key, make sure that it's working correctly. It is advisable to purchase a spare Mazda 3 remote, especially when your car is susceptible to problems. You can purchase one online or at a local automotive store. Make sure you review the reviews before buying to ensure that you don't purchase a key fob which isn't compatible with your vehicle. How to change the battery with a spare key? It's depressing to find out that the key fob you used to use has gone out, and you are not able to unlock your car. Fortunately, it's easy to replace the battery and save some money at the dealer. Press the auxiliary key button located at the back of the keyfob. This will detach the key made of metal and reveal the slots on both sides of the case. Use the screwdriver's flathead to push it into one of these slots and then gently remove the two parts of the case. Once the battery is fully exposed, remove the case and place it in a spot where you'll never forget it. Before you begin, be sure you have a brand new replacement battery. They can be found at any store that sells batteries or at an Mazda dealer close to Winter Garden. Choosing the correct battery will ensure that your key fob is working properly. Next, put the new battery in the correct place and replace the cap of the battery. Be careful not to damage the small rubber ring that the battery rests on. Then press the two halves of the key fob together until you hear a click. How do you reset the Keyless Entry System The key fob in your Mazda 3 is not only a convenience, it's also an important security feature. The car won't start if the key is stolen or lost, even if you've got an extra fob. The key fob needs to be reprogrammed by the dealer to allow it to work again. This could be a costly and time-consuming process therefore it's a great idea to understand how to reset the system yourself. Remove the battery from the system for 15 minutes. This will take out any remaining electricity from the onboard computer. Then, disconnect both LF-ECU and demand switch connectors. Check continuity between the following terminals. To program a new key or a spare, place it in the slot and turn the ignition to ON. Leave the key in for around five seconds and then turn off. The information from the key 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 as you want but only one can be used at a certain time. This will keep unauthorised individuals from stealing your key and getting access to your vehicle. You can purchase a replacement keyfob online, but it will still need to be programmed and cut by an authorized dealer.