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How to Add, Change, and Reprogram a Mazda 3 Spare Key It's a good idea to have an extra key at hand no matter if you've dropped the keyfob or it has stopped working. This article will show you how to add, alter and re-programme your Mazda 3 keyfobs. A word of caution Some keys require programming by a professional locksmith or dealer, while others do not. Use only official Mazda replacements to replace your key fob. How to add a spare key If you're unable to receive a spare keys from the dealer when you purchase your Mazda 3 or accidentally break the one you have but don't worry, there is still a way to add another key. You'll need to use a flathead screwdriver and the CR2025 replacement battery. Once you've got the tools you can access the key fob and swap the battery. First, locate the button that allows you to release the key. It's located on the underside the metal part. It's easy to locate. The cover on the back should fall off when you press the button. Then, place the screwdriver's tip into the notch at the top or in the space, and take the metal part away. Once the auxiliary key is removed, insert the new or spare key into the slot. Switch the ignition on and wait for five seconds, and then turn it to OFF. This will allow the system to recognize the new key and start your vehicle in the future. It is only possible to program three keys in 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 safeguard to stop unauthorised users from activating your keys and starting your vehicle. How to Reprogram a Spare Key It's a smart idea know how to reprogram an extra key in the event that the original key is lost or stolen. This will stop unauthorized persons from opening your car or taking it. This will work with any Mazda. You will require two keys that are working to begin the reprogramming. If you don't own two working keys, you'll have to bring your vehicle to the dealer to get it done. Begin by getting into your driver's seat and shutting the door, excluding for the one that's opened. Place the working key into the slot, and then set the ignition to ON. Then wait five seconds before taking out the key. Repeat the process with the second key. After you've programmed your new key, you should have three keys that will work to start your vehicle in the future. Test each key to make sure that they're functioning properly before taking them off. You should think about purchasing an extra Mazda 3 remote, especially when your car is susceptible to issues. You can find one online or at your local automotive store, but make sure to read reviews before buying so 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 more frustrating than discovering that your key fob battery has been damaged and you're unable to unlock your vehicle. It's simple to replace the battery yourself and save money at the dealership. The first step is to press the auxiliary key button that is located on the back of the key fob. This will remove the key from the metal and reveal a slot on each side of the case. Press the flathead screwdriver into one of these slots and then gently take apart the two halves of the case. When the battery is completely exposed, take it out and set aside the case somewhere that you won't forget about it. Be sure to bring a replacement battery prior to beginning. They can be bought at any retailer that sells batteries or from a Mazda dealer in Winter Garden. Using the right type of battery will ensure that your key fob works perfectly. Replace the cap of the battery and then insert the new battery. Be careful not to scratch the rubber ring on which the battery rests. The two halves should be pressed together until you hear a click. How do I reset the Keyless Entry System The Mazda 3 key fob is not just a practical feature. It also serves as a security measure. If you lose your key, or have it stolen, the car will not start even if you've got the spare key fob. This is because the key fob has to be reprogrammed by the dealership to function properly. This can be a painful and costly experience. Therefore, it's advisable to learn how you can reset the system. Remove the battery from the system for 15 minutes. This will clear any residual power from the on-board computer. Then, disconnect the LF ECU and demand switch connectors. Check continuity between the following 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 around five seconds and then switch off. The information from the key will be transferred to your vehicle's computer, and the new fob will be able start your car in the future. You can program as many fobs as you want however only one must be used at a given time. This will prevent unauthorised people from stealing your keys and getting access to your vehicle. www.g28carkeys.co.uk can purchase a new keyfob online, however it will still need to be programmed and cut by a dealer.