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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 just stopped working, it's recommended to keep an extra key in your pocket. This article will teach you how to add, change or reprogramme your Mazda 3 keyfobs. A word of warning Certain keys require programming by a locksmith professional or dealer, while others don't. Make sure you use only official Mazda replacements to replace your key fob. How to Add a Spare Key If you're not lucky enough to receive a spare key from the dealer when you buy your Mazda 3 or accidentally break your current one Don't fret, there's still a way to add another key. You'll need the flathead screwdriver, as well as an CR2025 battery. Once you've got the tools and are ready to remove the key fob and change the battery. First look for the key release button for the auxiliary key. It's located underneath the metal piece and is easy to find. The cover on the back should fall off when you press the button. Then, insert the screwdriver head into the notch on top or in the space, and take the metal part away. After the auxiliary keys are removed, insert the new or spare key into the slot. Set the ignition to ON and wait for around five seconds before setting it to off. This will allow the system to recognize the new key and begin your vehicle in the future. It is important to remember that you can only program up to three keys on your Mazda 3. You don't want to have to utilize more than two key fobs to start your vehicle. This is a security precaution designed to stop unauthorized users, like valet drivers who are not authorized to use your key and thereby starting your car. How to reprogram an unrepaired key? It's smart to know how to reprogram a spare key in the event that your original key is lost or stolen. This will stop unauthorised people from abusing your vehicle and re-starting it. This will work with any Mazda. You will require two keys that work for the reprogramming to begin. If you don't have two functioning keys, you'll have to bring your car to the dealership to have it done. Begin by stepping into the driver's seat and close all the doors, except the one that is open. Place the first working key in the slot, then turn the ignition to the ON position. Then wait five seconds before taking out the key. Repeat the process with the second key. After you finish programming your new key you should have 3 keys that work to start your car in the future. Check each key to make sure they're working correctly before throwing them away. You should think about buying a spare Mazda 3 remote, especially in cases where your car is prone to problems. You can purchase one online or at your local automotive retailer, but make sure to read reviews prior to purchasing so you aren't purchasing a key fob that's not compatible with your car. How do you change the battery on a spare key There's nothing worse than finding that the battery for your key fob has been damaged and you're unable to unlock your car. It's simple to replace the battery yourself and save money at the dealer. Press the auxiliary key button on the back of the keyfob. This will take out the key from the metal and reveal a slot on each side of the case. Insert the flathead screwdriver into one of these slots and gently pry apart the two sides of the case. When the battery is completely exposed, remove it and place the case somewhere safe from being lost. Be sure to bring an extra battery in place before you begin. You can purchase them at any store that stocks batteries or at a Mazda dealer near Winter Garden. Using the correct type of battery will ensure that your key fob works effectively. Then, place the new battery into place and replace the cap on the battery. Be careful not to scratch the small rubber ring that the battery sits on. The two halves should be pressed together until you hear a click. How do you reset the Keyless Entry System The key fob that you have in your Mazda 3 is not only a convenience, it's also an important security feature. The car won't start if your key is stolen or lost, even if you've got an extra key fob. The key fob has to be reprogrammed by a dealer to enable it to function again. This can be an expensive and frustrating experience therefore it's a great idea to learn how to reset the system yourself. To reset the system, unplug the battery for about 15 minutes. This will eliminate any residual electrical current from the computer on board. Next, disconnect both the LF-ECU connector as well as the demand switch connectors. Check continuity between the following terminals. To program an entirely new key or spare, place it in the slot and set the ignition to ON. Put mazda key fobs in for about five seconds, then turn it off. The key's information is transferred to the computer of your vehicle and the new fob can start your vehicle. You can program up to three fobs, but you should only use one at one time. This stops unauthorized individuals from copying your key and getting ahold of your car. You can purchase a new keyfob on the internet, but it still needs to be cut and programmed by a dealer.