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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIt’s a good idea always to have an extra key in your pocket no matter if you’ve dropped the keyfob or it stopped working. This article will explain how to add, modify and re-programme your Mazda 3 keyfobs.Be aware that some keys require programming by a professional locksmith, while others do not. Make sure you use only authentic Mazda replacements to replace your key fob.How do I add a spare keyIf you’re unable to find a spare key from the dealer when you purchase your Mazda 3 or accidentally break your current key, don’t worry — there’s an option to make another key. You’ll need an flat-head screwdriver and the CR2025 replacement battery. Once you’ve got all the equipment, it is time to open the key fob. Locate the auxiliary key release. It’s located underneath the metal portion and is easy to locate. The cover on the back should fall off the moment you press the button. Next, insert the head of the screwdriver into the notch or spacing on the top of the metal piece and then pull it off.Insert your spare key or a new one into the slot after removing the accessory key. Set the ignition to ON, and wait about five seconds before turning it to off. This will add the new key’s details to the system and allow it to start your car in the future.It is important to remember that you can only program up to three keys for your Mazda 3. You don’t want to utilize more than two keys to start your car. This is a safety measure designed to stop unauthorized users, like valet drivers, from activating your key and thereby launching your vehicle.How to Reprogram a spare keyIt’s a smart idea to know how to reprogram a spare key in the event that the original key is lost or stolen. This will prevent unauthorised persons from taking your car and then starting it. This should work with any Mazda. You will need two keys that are functioning to begin the reprogramming. If you don’t own two working keys, you’ll need bring your car to the dealership to have it done.Begin by putting yourself in the driver’s seat, and shutting the door, excluding for the one that’s already opened. Set the ignition to ON and insert the first working key. Wait five seconds before removing the key. Repeat with the second key.Once you’ve finished programming your new key, you should have three working keys that you can use to start your car in the future. Before placing each key in storage, make sure it’s functioning correctly.It is advisable to purchase a spare Mazda 3 remote, especially if your car is prone to problems. You can buy one online or in your local automotive store. Make sure to read reviews before purchasing to ensure that you don’t purchase the wrong key fob that isn’t compatible with your car.How do you change the battery using a spare keyThere’s nothing worse than discovering that the battery for your key fob has failed and you are unable to unlock your vehicle. Luckily, it’s easy to replace the battery and save some cash at the dealership.The first step is to press the auxiliary button on the back of the key fob. This will release the key from the metal and reveal the slots on both sides of the case. Put the flathead screwdriver in one of these slots. Then, gently pry apart the two halves of the case. When the battery is fully exposed, take it out of the case and put it somewhere that you will not forget about it.Be sure to have a new battery ready prior to beginning. mazda car keys replacement are available at any store that sells batteries or at a Mazda dealer near Winter Garden. Choosing the correct battery will ensure that your key fob works effectively.Then, put the new battery in its place and then replace the cap of the battery. Be careful not to scratch the rubber ring on which the battery rests. Press the two halves together until you can hear the click.How to reset the system’s Keyless Entry SystemThe key fob on your Mazda 3 is not only an added convenience, but it’s also an important security feature. The car won’t start if your key is lost or stolen even if you have an extra fob. The key fob should be reprogrammed by a dealer to enable it to function again. This can be a costly and frustrating ordeal, so it’s a good idea to understand how to reset the system yourself.To reset the system, disconnect the battery for around 15 minutes. This will take out any remaining electrical current from the computer on board. Then, disconnect both the connectors for the LF-ECU and the demand switch connectors. Verify that the connections are in good order between the terminals.To program a new key, or a spare, insert it into the slot and turn the ignition to ON. Turn off the ignition after approximately five minutes. The key information will now be transferred to your vehicle’s computer, and the new fob will be able start your car in the future. You can program as many fobs as need, but only one should be utilized at any certain time. This will stop unauthorized individuals from stealing your key and gaining access to your vehicle. You can buy a new key fob on the internet, but you’ll still have to visit an expert locksmith or dealer to cut it and programmed.