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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, modify and re-programme your Mazda 3 keyfobs. Certain keys require programming from an expert locksmith, while others do not. Be sure to only make use of official Mazda replacements for your key fob. How to Add a Spare Key You can add an additional key if you don't have a spare key, or when you accidentally damage your current one. To accomplish this, you'll require an incredibly small screwdriver, a flathead screwdriver, and a new CR2025 battery. Once you've got these items and are ready to open the key fob and swap the battery. First, locate the key release button for the auxiliary key. It's located underneath the metal piece and is easy to find. When you press the button, the cover should be removed immediately. Then, place the screwdriver head into the notch at the top or in the space, and remove the metal part. Once the auxiliary key has been removed, insert your new or spare key into the slot. Turn on the ignition and wait for about five seconds, and then turn it to off. This will add the new information on the key to the system which will allow it to start your vehicle in the future. It's important to know that you can only program up to three keys on your Mazda 3. The last thing you want is to have more than two functioning key fobs and not being capable of getting your vehicle started. This is a security measure to stop anyone who is not authorized from activating your keys and starting your car. How to Reprogram a spare key If you have a spare key, it's a good idea know how to program it in the event your original key is lost or stolen. This will prevent unauthorized people from starting your car, or stealing it. This process should work on any Mazda however, you'll require two working keys to start the process of reprogramming. If you don't have two functioning keys, you'll have to take your vehicle to the dealership to complete the process. Begin by putting yourself in the driver's seat and closing the door, except for the one that's been opened. Place the first working key in the slot, and 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 programmed your new key, you should have three working keys you can use to start your car in the future. Check each key to make sure that they're working properly before throwing them away. It's a good idea to purchase an extra Mazda 3 key fob, particularly if you're a driver who is prone to losing keys or has other issues with it. You can buy one online or in your local auto store. Be sure to review the reviews before buying so that you don't get a key fob which isn't compatible with your car. How do I change the battery on a spare key? It's depressing to find out that the key fob you used to use has gone out and you're not able to unlock your car. It's easy to change the battery yourself and save money at the dealer. The first step is to press the auxiliary button on the back of the key fob. This will take out the key made of metal and reveal two slots on the opposite side of the case. The flathead should be inserted into one of these slots, and then gently pull the two halves apart. After the battery is fully exposed, remove the case and place it somewhere that you will not forget it. Before you begin, be sure that you have a new replacement battery. They are available in any store that sells batteries or at an Mazda dealer near Winter Garden. Choosing the correct battery will ensure that your key fob is working correctly. Next, put the new battery in the correct place and replace the cap on the battery. Be careful not to scratch the rubber ring that holds the battery. Then press the two halves of the key fob until you hear the sound of a click. How to Reset a Keyless Entry System The Mazda 3 key fob is not just a convenience. It also serves as a security measure. The car won't start if your key is stolen or lost, even if you've got a spare key fob. This is because the key fob needs to be reset at the dealership to work properly. This could be a costly and frustrating ordeal 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 erase any residual electrical current from the computer on board. Then, disconnect the LF ECU and demand switch connectors. Verify the continuity between the next terminals. To program a new key, or a spare, place it in the slot and turn the ignition to ON. Keep mazda demio key in place for about five seconds, then switch it off. The information from the key will be added to the vehicle's computer, and the new fob will be able to start your car in the future. You can program as many fobs as you want however only one should be used at any specific time. This will prevent unauthorised people from stealing your keys and gaining access to your car. You can purchase a replacement key fob online, however you'll still need to go to a dealer or locksmith to cut it and programmed.