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How to Add, Change, and Reprogram a Mazda 3 Spare Key If you've dropped your key fob on the ground or it has stopped working, it's an excellent idea to keep an extra key in your pocket. This article will cover everything you need to know about the process of adding, changing, and changing your Mazda 3 key fobs. A word of warning Some keys require programming by a professional locksmith or dealer, while other keys don't. Be sure to only use genuine Mazda replacements for your key fob. How do you add a spare key You can also add another key in the event that you don't have a spare key, or in the event that you break your existing one. To do this, you'll need an inexpensive flathead screwdriver as well as an CR2025 battery that's new. Once you've got all the equipment, it is time to open the key fob. First, locate the auxiliary key release button. It's located under the metal part and is easy to locate. When you press the button, the cover should slide off immediately. Then, you can insert the screwdriver's head into the notch, or the spacing on the top of the metal piece and pull it off. Once 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 turning it to off. This will allow the system to recognize the new key and begin your vehicle in the future. You can only program three keys in your Mazda 3. The last thing you want is to have more than two functioning key fobs and not be capable of getting your vehicle started. This is a safeguard to stop unauthorized users from activating your key fobs and starting your vehicle. How to Reprogram a spare key It's a smart idea know how you can reprogram an extra key in the event that the original key is lost or stolen. This will stop unauthorised people from getting into your car and causing damage to it. This should work with any Mazda. You will need two keys that work to begin the reprogramming process. If you don't have two functioning keys, you'll need take your vehicle to the dealer to get it done. Begin by stepping into the driver's seat, close all the doors, except the one that is open. Set the ignition to ON and then insert the first working key. Take five seconds before removing the key. Repeat with the second key. Once you've finished programming your new key, you should have three keys that you can use to start your car in the future. Before saving each key, be sure that it's functioning properly. You should think about buying an extra Mazda 3 remote, especially in cases where your car is prone to issues. You can buy one online or at your local auto retailer, but make sure to read the reviews prior to purchasing so you aren't purchasing an item that isn't compatible with your car. How to change the battery with a spare key? There's nothing more frustrating than finding that the battery on your key fob died and you can't unlock your vehicle. Fortunately, it's easy to replace the battery and save some cash at the dealership. Press the auxiliary button on the back of the keyfob. This will release the metal auxiliary key and expose a slot on both sides of the case. Put the flathead screwdriver in one of these slots and then gently break the two halves of the case. Once the battery has been fully exposed, take it out of the case and place it in a spot where you'll never forget it. Before you begin, make sure you have a brand new replacement battery. You can purchase them at any retailer that sells batteries or at a Mazda dealer near Winter Garden. The correct type of battery is essential to ensure that your keyfob works correctly. Then, place mazda car key replacement in the correct place and replace the cap on the battery. Be careful not to damage the small rubber ring the battery is placed on. Press the two halves together until you 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 feature. The car will not start if the key is lost or stolen, even if you've got an extra fob. The key fob must be reprogrammed by the dealer to enable it to function again. It can be a frustrating and expensive ordeal. Therefore, it's advisable to understand how you can reset the system. To reset the system, remove the battery for 15 minutes. This will remove any residual electrical power in the on-board computer. Next, disconnect both the LF-ECU and demand switch connectors. Check for continuity between the following terminals: To program the new key or spare, insert it into the slot and turn the ignition to ON. Stop the ignition after about five minutes. The key information is now transferred to the computer of your vehicle and the new fob will start your car. You can program up to three fobs, however, you should only use one at each time. This prevents unauthorized people from copying the key and getting ahold of your car. You can purchase a new keyfob online, however it still needs to be programmed and cut by an authorized dealer.