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How to Add, Change, 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 a spare key on hand. This article will go over everything you must know about the process of adding, changing, and programming your Mazda 3 key fobs. Warning: Some keys require programming by an experienced locksmith, whereas others do not. Be sure to only use genuine Mazda replacements for your key fob. How to add a spare key If you're unable to receive a spare key from the dealer when you purchase your Mazda 3 or accidentally break your current one Don't fret, there's an option to get another key. To accomplish this, you'll require a small screwdriver with a flat head and the new CR2025 batteries. Once you have these items, it's time to open the key fob to change the battery. Find the auxiliary key release. It's located under the metal component and is easy to locate. Once you press the button, the back cover should fall off right away. Then, you can insert the screwdriver's head in the notch at the top or in the space, and pull the metal piece off. Once mazda 3 key fob is removed, insert the new or spare key into the slot. Set the ignition to ON and wait about 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 keep in mind that you can only program up to three keys for your Mazda 3. You don't want to have to use more than two key fobs in order to start your car. This is a security measure designed to prevent unauthorized users, like valet drivers from activating your key and thereby starting your car. How to Reprogram a spare key It's a good idea to know how to reprogram a spare key in the event that the original key is lost or stolen. This will keep unauthorised persons from opening your car or taking it. This will work with any Mazda. You will need two keys that are functioning to begin the reprogramming process. If you don't have two working keys, it's best to take your car to a dealer to get this done. Begin by getting into your driver's seat and closing the door, except for the one that's already opened. Insert the first working key in the slot, and then turn the ignition to ON. Take five seconds before removing the key. Repeat the process with the second key. After you finish programming your new key, you'll have three keys that will be able to start your car in the future. Check each key to make sure that they're functioning properly before placing them away. You should think about purchasing a spare Mazda 3 remote, especially when your car is susceptible to problems. You can buy one online or at your local auto store, but make sure to read reviews before purchasing so that you can avoid purchasing an item that isn't compatible with your car. How do I change the battery on a spare key There's nothing more frustrating than finding that your key fob battery has died and you can't unlock your vehicle. It's not a problem to replace the battery and save some cash at the dealership. The first step is to press the auxiliary key button 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. Put the flathead screwdriver in one of these slots, and gently take apart the two halves of the case. When 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 that you have a brand new replacement battery. You can find these at any retailer that sells batteries or at a Mazda dealer near Winter Garden. The right kind of battery is crucial to make sure that your keyfob functions properly. Next, put the replacement battery in place and replace the cap of the battery. Be careful not damage the rubber ring on which the battery rests. The two halves should be pressed together until you can hear the click. How to Reset the Keyless Entry System The Mazda 3 key fob is not just a convenient feature. It also serves as a security measure. If you lost your key or had it stolen, the car will not start even if it has the spare fob. The key fob should be reset by the dealer to enable it to function again. It can be a stressful and costly process. Therefore, it's advisable to learn how to reset the system. To reset the system, disconnect the battery for around 15 minutes. This will eliminate any residual electricity from the on-board computer. Then, disconnect the 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 set the ignition to ON. Switch off the ignition after approximately five seconds. The key information is now added to the computer in your car and the new fob can start your car. You can program as many fobs you would like but only one can be utilized at any given time. This will stop unauthorized individuals from stealing your key and getting access to your car. You can buy a new keyfob online, however it still needs to be cut and programmed by a dealer.