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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea to have an extra key on hand no matter if you've dropped the keyfob or it was unable to function. This article will tell you how to add, alter and re-programme your Mazda 3 keyfobs. Note: Some keys require programming from an expert locksmith, while others do not. Make sure you only use genuine Mazda replacements for your key fob. How to Add a Spare Key You can also add an additional key in case you don't have a spare key, or in the event that you break the one you have. You'll need to use a flathead screwdriver, and an CR2025 battery. Once you have the items you need, it's time to open the key fob. First find the auxiliary key release button. It's located on the underside of the metal portion and is easy to locate. Once you hit the button, the back cover should fall off right away. Then, you can insert the screwdriver head into the notch on top or in the space, and take the metal part away. Insert your new or spare key into the slot after removing the auxiliary key. Turn on the ignition and wait for about 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's important to know that you can only program up to three keys for your Mazda 3. The one thing you don't want is to have more than two functioning key fobs and not being capable of getting your vehicle started. This is a security precaution that is designed to block unauthorized users, like valet drivers from activating your key and thereby launching your vehicle. How to Reprogram a spare key If you have a spare key, it's a good idea to know how to reprogram it in the event that your original key is stolen or lost. This will stop unauthorized persons from starting your car, or stealing it. This will work with any Mazda. You'll need two keys that work to start the reprogramming process. If you don't have two functioning keys, you'll need to bring your car to the dealership to complete the process. Start by stepping into the driver's position, and shutting all doors, with the exception of the one that is open. Place the first working key in the slot, then set the ignition to the ON position. Wait five seconds, then remove the key and repeat the process with the second working key. Once you've completed programming your new key you should have 3 keys that will allow you to start your vehicle in the future. Test each key to ensure sure that they're functioning properly before taking them off. It's a good idea buy an extra Mazda 3 key fob, especially if your car is one who frequently loses their key or has other issues with it. You can buy one online or at your local auto store. Make sure you review the reviews before buying to ensure you don't buy an item that isn't compatible with your car. How to change the battery with a spare key? It's a nightmare to discover that your key fob has died and you're locked out of your vehicle. 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 that is located on the back of the key fob. This will remove the key from the metal and reveal two slots on the opposite side of the case. Insert the flathead screwdriver into one of these slots. Then, gently break the two halves of the case. Once the battery is fully exposed, take it out of the case and put it somewhere that you will not forget about it. Before you begin, make sure you have a new replacement battery. These batteries can be purchased at any store selling batteries or from a Mazda dealer in Winter Garden. Using the correct type of battery will ensure that your key fob operates perfectly. Replace the battery cap and then insert the new battery. Be careful not to scratch the rubber ring on which the battery rests. Then, press the two halves of the key fob until you hear a click. How do I reset a Keyless Entry System The Mazda 3 key fob is not just a piece of equipment for convenience. It's 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. This is because the key fob needs to be reprogrammed at the dealership to work once more. This can be a costly and frustrating ordeal, so it's a good idea to understand how to reset the system yourself. To reset the system, disconnect the battery for 15 minutes. mazda keys replacement will clear any residual power from the on-board computer. Then, disconnect both LF-ECU connector as well as the demand switch connectors. Then, check continuity between the following terminals: To program an entirely new key or spare, insert it into the slot and turn the ignition to ON. Turn off the ignition after about five minutes. The key's details will be added to the vehicle's computer, and the new fob will be able to start your vehicle in the future. You can program as many fobs as desire however only one should be in use at any certain time. This will keep unauthorised individuals from stealing your keys and getting access to your car. You can purchase a replacement key fob on the internet, but you'll still need to visit an authorized locksmith or dealer to have it cut and programmed.