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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 simply stopped working, it's always best to have an extra key available. This article will cover everything you should be aware of when the process of adding, changing, and programming your Mazda 3 key fobs.Certain keys require programming from professional locksmiths, while others do not. Use only authentic Mazda replacements to replace your key fob.How do I add an extra keyYou can add an additional key in case you don't have a spare key available or when you accidentally damage the one you already have. You'll need to use the flathead screwdriver, as well as a CR2025 new battery. Once you've got these items then it's time to open the key fob. Locate the auxiliary key release. The button is located on the underside of the metal part. It's easy to find. Once you hit the button, the cover should slide off immediately. Next, insert the head of the screwdriver into the notch or spacing at the top of the metal piece and pull it off.Once the auxiliary key is removed, insert the new or spare key into the slot. Set the ignition to ON and wait for around five seconds before turning it to OFF. This will register the new key's information into the system and allow it to start your car in the future.It's important to keep in mind that you can only program up to three keys for your Mazda 3. The one thing you don't want is to have more than two working key fobs and not be able to get your car started. This is a security precaution designed to prevent unauthorized users, such as valet drivers from activating your key and starting your car.How do I reprogram an unrepaired key?It's smart to know how you can reprogram a spare key in the event that your original key gets lost or stolen. This will prevent unauthorized people from starting your car, or taking it. This should work with any Mazda. You'll need two keys that are functioning to begin the reprogramming process. If you don't own two keys that work then it's best to bring your Mazda to the dealer to get this done.Begin by putting yourself in the driver's seat and shutting the door, excluding for the one that's already opened. Place the working key into the slot, and then turn the ignition to ON. After five seconds, remove the key. Repeat the process with the second key.Once you've finished programming your new key, you'll have three working keys you can use to start your car in the future. Test each key to make sure they're working correctly before placing them away.It is advisable to purchase an extra Mazda 3 remote, especially if your car is prone to issues. You can purchase one online or at your local auto store. Make sure to review the reviews before buying to ensure that you don't purchase one that's not compatible with your car.How do I change the battery on a Spare KeyIt's depressing to find out that your key fob is dead, and you are in a position to not unlock your vehicle. It's easy to change the battery yourself and save money at the dealer.Press the auxiliary key button at the back of the keyfob. This will release the metal auxiliary key and expose two slots on the sides of the case. Put the flathead into one of these slots and then gently pull the two halves of the case apart. Once the battery is fully exposed, take it out and place the case somewhere you won't forget it.Before you begin, be sure that you have a new replacement battery. They can be bought at any store selling batteries or from a Mazda dealer in Winter Garden. Using the right type of battery will ensure that your key fob operates properly.Then, place the new battery in its place and then replace the battery cap. Be careful not to damage the rubber ring that holds the battery. Finally, press the two parts of the key fob together until you hear the sound of a click.How can I reset the Keyless Entry SystemThe key fob on your Mazda 3 is not only an extra convenience, but also an important security feature. The car won't start if your key is lost or stolen, even if you've got a spare fob. The key fob needs to be reprogrammed by the dealer to allow it to work again. This can be a painful and costly process. Therefore, it's best to understand how you can reset the system.To reset the system, unplug the battery for approximately 15 minutes. mazda key will eliminate any remaining electrical current from the computer on board. Then, disconnect the LF ECU and demand switch connectors. Check for continuity between the terminals.To program the new key or spare, place it in the slot and turn the ignition to ON. Turn off the ignition after approximately five minutes. The information from the key will be added to the vehicle's computer, and the new fob will be able to start your car in the future. You can program as many fobs as want however only one should be used at a particular time. This stops unauthorized individuals from copying the key and getting ahold of your vehicle. You can purchase a new keyfob on the internet, but it still needs to be programmed and cut by a dealer.