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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIf you've dropped your key fob on the floor or it has stopped working, it's always recommended to keep a spare key handy. This article will go over everything you need to know about adding, changing, or reprogramming your Mazda 3 key fobs.Note: Some keys require programming by a professional locksmith, while others don't. Be sure to only use official Mazda replacements for your key fob.How do you add an additional keyIf you're not lucky enough to get a spare key from the dealership when you buy your Mazda 3 or accidentally break the one you have but don't worry, there's still an option to make another key. To accomplish this, you'll need a small flathead screwdriver and an CR2025 battery that's new. Once you've got these tools, it's time to access the key fob and change the battery. Find the auxiliary key release. It's located under the metal component and is easy to locate. When you hit the button, the back cover should fall off right away. Then, you can insert the head of the screwdriver into the notch, or the spacing at the top of the metal part and then pull it off.Insert your spare or new key into the slot after you have removed the auxiliary key. Set the ignition ON and then wait for around five seconds, and then turn 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 into your Mazda 3. The last thing you want is to have more than two working key fobs, and not be in a position to get your vehicle started. This is a safeguard to stop anyone who is not authorized from activating your keys and launching your vehicle.How to Reprogram a spare keyIf you have a spare key, it's best to be aware of how to reprogram it in case your original key is lost or stolen. This will stop unauthorized persons from taking your car and then starting it. This will work with any Mazda. You'll require two keys that work for the reprogramming to begin. If you don't have two keys that function, it's best to take your vehicle to a dealer to have this done.Start by getting into the driver's position and close all the doors with the exception of the one that is open. Set the ignition to ON and insert the first functioning key. After five seconds, remove the key. Repeat mazda 3 spare key with the second key.After programming your new key, you should have 3 keys that start your vehicle in the future. Before placing each key in storage, make sure that it's functioning properly.It's a good idea purchase a spare Mazda 3 key fob, especially if your car is one who has a tendency to lose their keys or has other issues with it. You can purchase one on the internet or at your local auto store. Make sure to go through reviews prior to purchasing so that you don't get a key fob which isn't compatible with your vehicle.How do you change the battery on a spare key?There's nothing more frustrating than discovering that the battery in your key fob has died and you can't unlock your car. It's easy to replace the battery yourself and save money at the dealership.The first step is to press the auxiliary key button located on the back of the key fob. This will remove the metal key auxiliary to reveal an opening on both sides of the case. Use the screwdriver's flathead to push it into one of these slots and gently break the two halves of the case. After the battery is fully exposed, remove the case and put it somewhere that you will not forget it.Be sure to bring a replacement battery prior to starting. These batteries can be purchased at any retailer that sells batteries or from a Mazda dealer in Winter Garden. The right kind of battery is essential to ensure that your key fob functions properly.Then, put the new battery into place and replace the battery cap. Be careful not to scratch the small rubber ring the battery sits on. Press the two halves together until you hear the click.How to Reset a Keyless Entry SystemThe key fob on your Mazda 3 is not only a convenience, it's also an important security feature. The car will not start if the key is lost or stolen even if you have an extra fob. The key fob must be reprogrammed by a dealer to make it work again. It can be a costly and stressful experience It's a good idea to know how to reset the system yourself.To reset the system, remove the battery for 15 minutes. This will eliminate any residual electric current from the onboard computer. Then, disconnect both LF-ECU connector as well as the demand switch connectors. Check continuity between the following terminals.To program a new key, or a spare, insert it into the slot and turn the ignition to ON. Put the key in for about five seconds, then turn off. The key's details will be added to the vehicle's computer and the new fob will be able start your vehicle in the future. You can program up to three fobs however, you should only use one at each time. This will keep unauthorised individuals from stealing your key and gaining access to your car. You can purchase a new key fob online, however you'll still need to go to a dealer or locksmith to cut it and programmed.