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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, whether you dropped your keyfob or it has stopped working. This article will go over everything you need to be aware of when the process of adding, changing, and changing your Mazda 3 key fobs. Note: Some keys require programming by an experienced locksmith, whereas others do not. Use only official Mazda replacements to replace your key fob. How do I add a spare key You can add an additional key in case you don't have a spare key or if you accidentally break the one you have. You'll need the flathead screwdriver, as well as a new CR2025 battery. Once you have these items you can access the key fob and change the battery. Locate the key release auxiliary. It's located on the underside of the metal part. It's easy to find. The back cover should slide off when you press the button. Then, insert the screwdriver's head into the notch or spacing on the top of the metal component and pull it off. Insert the spare or new key into the slot after you have removed the secondary key. Switch the ignition on and wait for five seconds before turning it to OFF. This will allow the system to recognize the new key and begin your vehicle in the future. It's important to note that you can only program up to three keys on your Mazda 3. The most important thing is to have more than two functioning key fobs but not be capable of getting your vehicle started. This is a security measure to stop anyone who is not authorized from activating your keys and launching your car. How to Reprogram a Spare Key If you have a spare key, it's best to be aware of how to reprogram it in case your original key is stolen or lost. This will stop unauthorised people from starting your car or stealing it. This method should work on any Mazda but you'll need two working keys to start the reprogramming. If you don't own two keys that function, it's best to take your Mazda to the dealer to have this done. Begin by putting yourself in the driver's seat and closing the door, except for the one that's opened. Place the working key into the slot, and then set the ignition to the ON position. Wait five seconds, then remove the key and repeat the procedure with the second key. Once you've completed programming your new key you should have 3 keys that allow you to start your car in the near future. Test each key to ensure sure that they're working properly before putting them away. You should think about buying an extra Mazda 3 remote, especially in cases where your car is prone to problems. You can buy one online or at your local auto store. Make sure to review the reviews before buying to ensure that you don't purchase a key fob which isn't compatible with your car. How do you change the battery with a spare key? There's nothing more frustrating than finding that the battery on your key fob been damaged and you're unable to unlock your vehicle. It's easy to change the battery yourself and save money at the dealership. The first step is to press the auxiliary button on the back of the key fob. This will detach the key from the metal and reveal an opening on each side of the case. Put the flathead into one of these slots, and then gently pull the two halves of the case apart. Once mazda 2 key is fully exposed, take it out and put it away in a place where you will not forget it. Be sure to bring an additional battery prior to beginning. They can be bought from any store that sells batteries or from a Mazda dealer in Winter Garden. Choosing the correct battery will ensure that your key fob is working perfectly. Replace the cap on the battery, and then replace the battery. Be careful not to scratch the small rubber ring that the battery is placed on. Press the two halves together until you hear a click. How to Reset the Keyless Entry System The Mazda 3 key fob is not just a piece of equipment for convenience. It's also an element of security. If you lose your key or have it stolen the car will not start, even if you have the spare key fob. This is because the fob that you have to be reprogrammed at the dealership in order to work properly. It can be a stressful and costly experience. So, it's best to learn how to reset the system. Remove the battery from the system for 15 minutes. This will eliminate any remaining electrical power in the on-board computer. Then, disconnect the LF-ECU and demand switch connectors. Check for continuity between the terminals. To program an entirely new key or spare, place it in the slot and turn the ignition to ON. Leave the key in for about five seconds, then turn it off. The key's information has been added to the computer in your car and the new fob will start your car. You can program up to three fobs however, you must only use one at a time. This will prevent unauthorized persons from copying your key and getting ahold of your vehicle. You can purchase a brand new keyfob online, but it still needs to be programmed and cut by an authorized dealer.