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How to Add, Change, and Reprogram a Mazda 3 Spare KeyWhether you dropped your key fob on the floor or it has stopped working, it's always recommended to keep a spare key on hand. This article will explain everything you need to be aware of when the process of adding, changing, and changing your Mazda 3 key fobs.A word of caution Certain keys require programming by a professional locksmith or dealer, whereas other keys do not. Be sure to only use genuine Mazda replacements for your key fob.How to add an extra keyIf you're not lucky enough to receive a spare keys from the dealer when you buy your Mazda 3 or accidentally break the one you have, don't worry -- there's the option of adding another key. To accomplish this, you'll need a small screwdriver with a flat head and an updated CR2025 battery. Once you've got all the equipment, it is time to open the key fob. Locate the auxiliary key release. mazda 2 key 's located underneath the metal portion and is easy to find. The back cover should come off the moment you press the button. Then, place the screwdriver's head in the notch at the top or into the space and pull the metal piece off.After the auxiliary keys are removed, insert your new or spare key into the slot. Turn on the ignition and then wait for around five seconds, then set it to off. This will allow the system to recognize the new key and start your vehicle in the future.It's important to keep in mind that you can only program up to three keys for your Mazda 3. The final thing you want is to have more than two functioning key fobs and not be able to get your car started. This is a security measure to prevent unauthorized users from activating your keys and launching your car.How to Reprogram a Spare KeyIf you have a spare key, it's important to know how to reprogram it in the event that the original key you had is lost or stolen. This will prevent unauthorized people from starting your car or stealing it. This should work with any Mazda. You'll require two keys that are functioning to begin the reprogramming process. If you don't own two working keys, you should take your vehicle to a dealer to have this done.Start by stepping into the driver's seat, close all the doors, except the one that is open. Insert the first working key in the slot, then turn the ignition to ON. Take five seconds before removing the key. Repeat with the second key.After programming your new key, you'll have three keys that start your vehicle in the future. Before saving each key, be sure that it's working correctly.It's a good idea to purchase a spare Mazda 3 key fob, particularly if you're a driver who frequently loses their key or has other issues with it. You can purchase one online or at a local automotive retailer, but make sure to read reviews prior to purchasing so you aren't buying a key fob that's not compatible with your car.How to change the Battery on a Spare KeyIt's depressing to find out that your key fob has died, and you are not able to unlock your car. It's not a problem to replace the battery and save yourself some money at the dealer.The first step is to press the auxiliary key button on the back of the key fob. This will release the metal key that is used as an auxiliary key, and expose two slots on the sides of the case. Place the flathead in one of these slots and then gently push the two halves apart. When the battery is completely exposed, take it out and place the case somewhere that you won't forget about it.Be sure to have a replacement battery prior to starting. These batteries can be purchased at any store that sells batteries or from a Mazda dealer in Winter Garden. Choosing the correct battery will ensure that your key fob operates perfectly.Then, place the new battery in place and replace the cap on the battery. Be careful not to damage the small rubber ring that the battery sits on. Then, press the two halves of the key fob until you hear a click.How can I reset the Keyless Entry SystemThe Mazda 3 key fob is not just a convenient feature. It also serves as a security measure. If you lose your key or had it stolen the car will not start, even if you have the spare fob. The key fob needs to be reprogrammed by a dealer to enable it to function again. This could be a costly and frustrating experience, so it's a good idea to learn how to reset the system yourself.To reset the system, disconnect the battery for around 15 minutes. This will eliminate any residual electric current from the onboard computer. Then, disconnect the LF -ECU and demand switch connectors. Check continuity between the following terminals.Place the key in the slot and switch the ignition on. Put the key in for about five seconds and then switch off. The key information will now be saved to your car's computer and the new fob will be able to start your car in the future. You can program as many fobs as you need however only one must be in use at any specific time. This will keep unauthorised individuals from stealing your key and getting access to your vehicle. You can purchase a brand new key fob online, however you'll still have to visit an expert locksmith or dealer to get it cut and programmed.