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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea always to keep an extra key in your pocket no matter if you've dropped your keyfob, or it has stopped working. This article will explain how to add, alter, and reprogramme your Mazda 3 keyfobs. A word of warning Certain keys require programming by a locksmith professional or dealer, whereas other keys do not. Be sure to only use 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 available or when you accidentally damage the one you already have. To accomplish this, you'll need an inexpensive flathead screwdriver as well as an updated CR2025 battery. Once you've got the tools and tools, you're ready to open the key fob. First look for the button that allows you to release the key. The button is on the underside of the metal portion. It's easy to find. The back cover should come off when you press the button. Then, place the screwdriver's head in the notch on top or into 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 approximately five seconds before turning it to off. This will allow the system to recognize the new key and start your vehicle in the future. You can only program three keys to your Mazda 3. You don't want to utilize more than two key fobs to start your vehicle. This is a precautionary measure to stop unauthorized users from activating your keys and launching your vehicle. How to Reprogram a Spare Key It's a smart idea know how to reprogram a spare key in the event that your original key gets lost or stolen. This will prevent unauthorised persons from taking your car and then starting 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 keys that work, it's best to take your vehicle to a dealer to have this done. Begin by stepping into your driver's seat and close the door, with the exception for the one that's open. Put the first working key into the slot, and then turn the ignition to ON. For five seconds, take the key out and repeat the procedure with the second working key. After you've programmed your new key, you should have three working keys that you can use to start your vehicle in the future. Test each key to be sure that they're functioning properly before placing them away. It's a good idea to buy a spare Mazda 3 key fob, especially if your car is one who often loses your key or has other issues with it. You can buy one online or at your local automotive store, but be sure to read the reviews prior to purchasing so you can avoid getting an item that isn't compatible with your car. How do you change the battery on a spare key It's a nightmare to discover that your key fob has failed and you're unable to unlock your car. It's not a problem to replace the battery and save yourself some money at the dealer. Press the auxiliary key button located at the back of the keyfob. mazda demio key will remove the key from the metal and reveal two slots on the opposite side of the case. Put the flathead into one of these slots and gently pry the two halves apart. Once the battery is fully exposed, take it out and place the case somewhere that you won't forget about it. Before you begin, make sure that you have a brand new replacement battery. You can find these in any store that sells batteries or at an Mazda dealer close to Winter Garden. Choosing the correct battery will ensure that your key fob is working properly. Then, put the new battery in the correct place and replace the battery cap. Be careful not to damage the rubber ring that holds the battery. Finally press the two halves of the key fob together until you hear the sound of a click. How to Reset a 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 had it stolen the car won't start, even if you have the spare key fob. The key fob should be reprogrammed by a dealer to enable it to function again. This can be a painful and expensive ordeal. Therefore, it's advisable to learn how you can reset the system. To reset the system, unplug the battery for around 15 minutes. This will clear any residual electric current from the onboard computer. Then, disconnect the LF ECU and demand switch connectors. Check for continuity between the terminals. Insert the key into the slot and turn on the ignition. Leave the key in for about five seconds, then switch off. The key's information has been stored in the car's computer and the new fob is able to start your car. You can program up to three fobs however, you must only use one at one time. This stops unauthorized individuals from copying the key and gaining access to your car. You can purchase a replacement key fob on the internet, but you'll still need to visit a dealer or locksmith to cut it and programmed.