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How to Add, lost mazda key , and Reprogram a Mazda 3 Spare Key If you've dropped your key fob on the floor or it has stopped working, it's a good idea to have an extra key in your pocket. This article will explain how to add, modify and re-programme your Mazda 3 keyfobs. A word of warning: some keys require programming by a professional locksmith or dealer, whereas other keys do not. Only use authentic Mazda replacements to replace your key fob. How do you add an additional key If you're unable to receive a spare key from the dealer when you purchase your Mazda 3 or accidentally break the one you have Don't fret, there is still a way to add another key. To accomplish this, you'll require an incredibly small screwdriver, a flathead screwdriver, and an updated CR2025 battery. Once you have these items then it's time to remove the key fob and replace the battery. First find the button that allows you to release the key. It's located underneath the metal component and is easy to find. When you press the button, the cover should be removed immediately. Then, place the screwdriver's head in the notch at the top or in the space, and take the metal part away. After the auxiliary key has been 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 register the new key's details to the system which will allow it to start your car in the future. It's important to know that you can only program up to three keys for your Mazda 3. You don't want to use more than two key fobs to start your vehicle. This is a security precaution designed to stop unauthorized users, such as valet drivers from activating your key and thereby starting your car. How do you reprogram a spare key If you have a spare key it's a good idea be aware of how to program it in the event your original key gets lost or stolen. This will stop unauthorised people from abusing your vehicle and re-starting it. This process is compatible with any Mazda but you'll need two working keys to start the process of reprogramming. If you don't have two functioning keys, you'll need take your vehicle to the dealership to have it done. Begin by putting yourself in the driver's seat, and shutting the door, excluding for the one that's opened. Insert the first working key in the slot, then set the ignition to the ON position. Wait five seconds before removing the key. Repeat with the second key. Once you've completed programming your new key, you'll have 3 keys that work to start your car in the near future. Before storing each key, make sure that it's working correctly. It's a good idea to purchase a spare Mazda 3 key fob, especially if you're someone who frequently loses their key or has other issues with it. You can buy one online or in your local automotive store. Make sure to look up reviews before you purchase to ensure you don't buy a key fob which isn't compatible with your car. How do I change the battery on a spare key There's nothing more frustrating than discovering that your key fob battery has died and you can't unlock your car. It's easy to change the battery yourself and save money at the dealership. Press the auxiliary key button at the back of the keyfob. This will remove the metal key that is used as an auxiliary key, and expose two slots on the sides of the case. The flathead should be inserted into one of these slots, and then gently pry the two halves of the case apart. Once the battery has been fully exposed, take it out of the case and place it somewhere you will not forget about it. Be sure to bring an additional battery before you start. You can purchase them in any store that sells batteries or at a Mazda dealer near Winter Garden. Using the correct type of battery will ensure that your key fob works perfectly. Then, put the new battery into place and replace the cap of the battery. Be careful not to damage the small rubber ring that the battery sits on. Finally, press the two halves of the key fob until you hear an audible click. How do I reset a Keyless Entry System The key fob on your Mazda 3 is not only an added convenience, but it's also an important security feature. The car won't start if your key is lost or stolen even if you have an extra fob. This is because the key fob needs to be reset at the dealership in order to work again. It can be a frustrating and costly experience. Therefore, it's best to learn how to reset the system. Remove the battery from the system for 15 minutes. This will eliminate any residual power from the on-board computer. Then, disconnect the LF ECU and demand switch connectors. After that, test for continuity between the following terminals: To program a new key or a spare, place it in the slot and set the ignition to ON. The ignition should be turned off after about five seconds. The key information is now added to the vehicle's computer and the new fob can start your vehicle. You can program as many fobs as would like however only one should be in use at any given time. This stops unauthorized individuals from copying the key and getting ahold of your vehicle. You can purchase a replacement keyfob from the internet, however it must be programmed and cut by an authorized dealer.