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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea always to keep an extra key on hand in case you lose the keyfob you were using or it stopped working. This article will cover everything you should learn about adding, changing, and reprogramming your Mazda 3 key fobs. Be aware that some keys require programming from an experienced locksmith, whereas others do not. Make sure you use only genuine Mazda replacements to replace your key fob. How do you add a spare key You can add a second key if you don't have a spare key available or if you accidentally damage the one you have. To do this, you'll need an inexpensive flathead screwdriver as well as an updated CR2025 battery. Once you've got all the equipment then it's time to open the key fob. Find the auxiliary key release. The button is located on the bottom of the metal portion. It's easy to find. When you hit the button, the back cover should fall off right away. Next, place the head of the screwdriver into the notch or space at the top of the metal piece and pull it off. After the auxiliary keys are removed, insert the new or spare key into the slot. Turn the ignition on and then wait for around five seconds, then turn it to off. This will add the new key's information to the system and allow it to start your vehicle in the future. It's important to note 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 in a position to get your vehicle started. This is a security measure to prevent unauthorized users from activating your keys and then starting your car. How to Reprogram a Spare Key If you have a spare key, it's best to know how to reprogram it in case your original key is lost or stolen. This will prevent unauthorised persons from taking your car and then starting it. This procedure should work with any Mazda however you'll need two keys that work to begin the reprogramming process. If you don't have two working keys, you'll need take your vehicle to the dealership to have it done. Begin by getting in your driver's seat and close the door, except for the one that's opened. Place the working key into the slot, then set the ignition to the ON position. Then wait five seconds before taking out the key. Repeat with the second key. After you've completed programming your new key, you should have three working keys that you can use to start your vehicle in the future. Test each key to ensure sure that they're operating correctly before throwing them away. You should think about buying an extra Mazda 3 remote, especially in the event that your vehicle is prone to problems. You can find one online or at your local automobile store, but make sure to read reviews before buying so that you can avoid getting a key fob that's not compatible with your vehicle. How do I change the battery on a spare key There's nothing worse than finding that the battery for your key fob has been damaged and you're unable to unlock your vehicle. It's easy to change the battery yourself and save money at the dealership. The first step is to press the auxiliary key button on the back of the key fob. This will release the key made of metal and reveal an opening on each side of the case. Press the flathead into one of these slots and then gently pry the two halves of the case apart. After G28 Car Keys is fully exposed, remove the case and place it somewhere you will not forget it. Be sure to have a replacement battery prior to starting. They can be bought at any retailer that sells batteries or from a Mazda dealer in Winter Garden. The right kind of battery is vital to ensure that your keyfob works correctly. Next, put the new battery into place and replace the cap on the battery. Be careful not to scratch the small rubber ring that the battery rests on. Finally, press the two halves of the key fob together until you hear the sound of clicking. How to reset a Keyless Entry System The key fob that you have in your Mazda 3 is not only a convenience, it's also an important security feature. If you lose your key, or have it stolen, the car will not start even if you have the spare key fob. The key fob has to be reprogrammed by the dealer to enable it to function again. This can be an expensive and stressful experience and it's a good idea to know 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. Next, disconnect the LF-ECU and demand switch connectors. Verify that the connections are in good order between the terminals. To program a new key or a spare, place it in the slot and set the ignition to ON. The key should remain in the ignition for about five seconds and then switch off. The key's details 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 any number of fobs you want however only one must be used at a certain time. This stops unauthorized individuals from copying your key and gaining access to your car. You can buy a new key fob online, but you'll need to visit an expert locksmith or dealer to cut it and programmed.