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How to Add, mazda 2 replacement key fob , and Reprogram a Mazda 3 Spare Key It's a good idea always to keep an extra key on hand, whether you dropped your keyfob, or it was unable to function. This article will cover everything you should be aware of when adding, changing, and reprogramming your Mazda 3 key fobs. A word of caution Certain keys need to be programmed by a professional locksmith or dealer, while others do not. Make sure you use only authentic Mazda replacements to replace your key fob. How do I add a spare key? You can add an additional key in case you don't have a spare key available or if you accidentally damage the one you already have. To accomplish this, you'll require an inexpensive flathead screwdriver as well as an CR2025 battery that's new. Once you've got these tools then it's time to open the key fob to change the battery. Find the auxiliary key release. The button is located on the underside of the metal part. It's easy to locate. The back cover should slide off the moment you press the button. Next, insert the screwdriver's head into the notch or the space on the top of the metal part and pull it away. After the auxiliary keys are removed, insert the new or spare key into the slot. Turn on the ignition and wait for about five seconds, then turn it to OFF. This will add the new information on the key to the system and allow it to start your vehicle in the future. It is only possible to program three keys on your Mazda 3. You don't want to have to use more than two key fobs in order to start your car. This is a security measure to stop anyone who is not authorized from activating your key fobs and starting your vehicle. How to Reprogram a Spare Key It's a smart idea know how to reprogram a spare key in the event that your original key gets lost or stolen. This will stop unauthorised people from stealing your car and starting it. This will work with any Mazda. You'll need two keys that are functioning to begin the reprogramming. If you don't have two keys that function, you should take your Mazda to the dealer to get this done. Start by stepping into driver's seat and shutting all doors, with the exception of the one that is open. Place the working key into the slot, then set the ignition to ON. Wait five seconds, then remove the key and repeat the process with a second key. Once you've programmed your new key, you should have three working keys you can use to start your vehicle in the future. Check each key to make sure that they're working properly before taking them off. It's a good idea to purchase an extra Mazda 3 key fob, especially if your car is one who frequently loses their key or has other issues with it. You can buy one online or in your local automotive store. Be sure to go through reviews prior to purchasing to ensure you don't buy an item that isn't compatible with your car. How do I change the battery with a spare key? There's nothing worse than finding that your key fob battery has been damaged and you're unable to unlock your car. It's not a problem to replace the battery and save some money at the dealer. Press the auxiliary key button at the back of the keyfob. This will release the metal key that is used as an auxiliary key, and expose an opening on both sides of the case. Press the flathead screwdriver into one of these slots and gently pry apart the two sides of the case. Once the battery is fully exposed, remove it and put it away somewhere safe from being lost. Be sure to have a new battery ready prior to beginning. These batteries can be purchased at any store that sells batteries or from a Mazda dealer in Winter Garden. Using the right type of battery will ensure that your key fob functions properly. Next, put the replacement battery in its place and then replace the battery cap. Be careful not to damage the rubber ring on which the battery rests. Finally, press the two parts of the key fob together until you hear the sound of clicking. How do I reset the system's Keyless Entry System The Mazda 3 key fob is not just a convenience. 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. This is because the key fob has to be reprogrammed at the dealership to work again. This can be an expensive and frustrating experience, so it's a good idea to know how to reset the system yourself. To reset the system, unplug the battery for 15 minutes. This will eliminate any remaining electricity from the on-board computer. Then, disconnect both the LF-ECU connector and the demand switch connectors. Check for continuity between the following terminals: To program a new key, or a spare, place it in the slot and turn the ignition to ON. The key should remain in the ignition for around five seconds, and then switch it off. The key's information will be added to the vehicle's computer and the new fob will be able start your vehicle in the future. You can program as many fobs as you would like, but only one should be utilized at any given time. This prevents unauthorized people from copying your key and gaining access to your car. You can purchase a new key fob online, however you'll still need to visit a dealer or locksmith to have it cut and programmed.