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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 in your pocket in case you lose your keyfob or it stopped working. This article will cover everything you should be aware of when changing, adding, and changing your Mazda 3 key fobs. A word of warning Certain keys require programming by a locksmith professional or dealer, whereas others do not. Make sure to make use of official Mazda replacements for your key fob. How do I add a spare key? If you're not fortunate enough to receive a spare key from the dealership when you purchase your Mazda 3 or accidentally break the one you have, don't worry — there's still the option of adding another key. You'll need the flathead screwdriver, as well as the CR2025 replacement battery. Once you've got the tools then it's time to open the key fob. First, locate the key release button for the auxiliary key. It's located under the metal portion and is easy to find. When you press the button, the cover should be removed immediately. Then, put the screwdriver head into the notch on top or the space and take the metal part away. Insert the spare or new key into the slot following the removal of the additional key. Set the ignition to ON, and wait for about five seconds before setting it to OFF. This will allow the system to recognize the new key and start your vehicle in the future. It's important to note that you can only program up to three keys for your Mazda 3. You don't want to have to use more than two key fobs to start your car. This is a security measure that is designed to block unauthorized users, like valet drivers, from activating your key and starting your vehicle. How do you reprogram an unrepaired key It's a smart idea to know how to reprogram a spare key in the event that the original key is lost or stolen. This will stop unauthorised people from getting into your car and causing damage to it. thekeylab will work with any Mazda. You'll need two keys that are functioning for the reprogramming to begin. If you don't own two working keys then it's best to bring your Mazda to the dealer to get this done. Begin by getting in your driver's seat and closing the door, except for the one that's opened. Place the first working key in the slot, then turn the ignition to ON. Then wait five seconds before taking out the key. Repeat the process with the second key. After you finish programming your new key you should have three keys that will work to start your vehicle in the future. Check each key to make sure that they're functioning properly before taking them off. You should consider buying a spare Mazda 3 remote, especially in cases where your car is prone to issues. You can buy one online or at a local automotive store. Make sure to review the reviews before buying so that you don't get an item that 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 gone out and you're not able to unlock your car. It's simple to replace the battery yourself and save money at the dealer. Press the auxiliary button on the back of the keyfob. This will remove the metal key and reveal an opening on each side of the case. Press the flathead into one of these slots and then gently pull the two halves apart. When the battery is fully exposed, take it out of the case and put it in a spot where you'll never forget it. Make sure you have a new battery ready before you start. They can be bought at any retailer that sells batteries or from a Mazda dealer in Winter Garden. The correct type of battery is essential to ensure that your key fob functions correctly. Then, put the new battery into place and replace the cap on the battery. Be careful not to scratch the rubber ring on which the battery rests. Press the two halves together until you can hear the click. How can I reset the Keyless Entry System The Mazda 3 key fob is not just a convenient feature. It's also a security measure. If you lose your key or have it stolen the car won't start even if you've got the spare fob. The key fob has to be reset by the dealer to enable it to function again. It can be a costly and frustrating experience It's a good idea to understand how to reset the system yourself. Remove the battery from the system for 15 minutes. This will remove any residual electricity from the onboard computer. The next step is to disconnect the LF-ECU and demand switch connectors. After that, test for continuity between the following terminals: Put the key in the slot, and turn the ignition ON. The key should remain in the ignition for around five seconds, and then switch off. The key's information is added to the computer in your car and the new fob can start your vehicle. You can program as many fobs as you desire but only one can be used at any given time. This will stop unauthorised people from copying your key and getting ahold of your car. You can purchase a replacement key fob on the internet, but you'll still need to visit an authorized locksmith or dealer to cut it and get it programmed.