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How to Add, Change, and Reprogram a Mazda 3 Spare Key If you've dropped your key fob on the ground or it simply stopped working, it's an excellent idea to keep an extra key available. This article will teach you how to add, change or reprogramme your Mazda 3 keyfobs. Note: Some keys require programming from an experienced locksmith, whereas others don't. Be sure to only make use of official Mazda replacements for your key fob. How to add a spare key If you're not fortunate enough to get a spare key from the dealership when you purchase your Mazda 3 or accidentally break the one you have Don't fret, there's an option to make another key. mazda 2 battery key 'll need an flat-head screwdriver and a CR2025 new battery. Once you've got these items then it's time to access the key fob and change the battery. First look for the button that allows you to release the key. The button is located on the underside of the metal part. It's easy to find. The cover that covers the back should come off as soon as you press the button. Next, insert the screwdriver's head into the notch or space at the top of the metal part and then pull it off. After the auxiliary keys are removed, insert your new or spare key into the slot. Set the ignition to ON and wait for five seconds before turning it to OFF. This will allow the system to recognize the new key and start your vehicle in the future. It is important to remember that you can only program up to three keys for your Mazda 3. The most important thing is to have more than two working key fobs and not being capable of getting your vehicle started. This is a safeguard to stop unauthorized users from activating your key fobs and starting your vehicle. How do I reprogram an unrepaired key? It's smart to be aware of how to reprogram an extra key in the event that your original key is lost or stolen. This will stop unauthorized persons from getting into your car and causing damage to it. This should work with any Mazda. You will require two keys that work to begin the reprogramming. If you don't have the two working keys, you'll have to take your vehicle to a dealership to get it done. Begin by getting into your driver's seat, and shutting the door, excluding for the one that's been opened. Put the first working key into the slot, then set the ignition to ON. Take five seconds before removing the key. Repeat the process with the second key. Once you've finished programming your new key, you should have three keys that you can use to start your vehicle in the future. Check each key to make sure that they're working properly before throwing them away. You should consider buying a spare Mazda 3 remote, especially in cases where your car is prone to problems. You can buy one online or at a local automotive store. Make sure you review the reviews before buying to ensure you don't buy a key fob which isn't compatible with your car. How do you change the battery on a spare key? There's nothing more frustrating than finding that the battery on your key fob died and you can't unlock your car. Luckily, it's easy to replace the battery and save yourself some money at the dealership. Press the auxiliary key button at the back of the keyfob. This will remove the metal key auxiliary and reveal slots on both sides of the case. Press the flathead screwdriver into one of these slots. Then, gently pry apart the two parts of the case. Once the battery is fully exposed, take it out of the case and place it somewhere you will not forget about it. Be sure to bring a replacement battery before you begin. They are available in any store that sells batteries or at an Mazda dealer close to Winter Garden. The right kind of battery is vital to ensure that your keyfob works correctly. Replace the cap of the battery and then replace the battery. Be careful not damage the rubber ring on which the battery rests. Finally press the two halves of the key fob until you hear the sound of clicking. How to Reset a Keyless Entry System The Mazda 3 key fob is not just a piece of equipment for convenience. It's also an element of security. 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 should be reset by the dealer to enable it to function again. This could be a costly and time-consuming process and it's a good idea to know how to reset the system yourself. To reset the system, remove the battery for approximately 15 minutes. This will remove any residual electrical current from the computer on board. Then, disconnect the LF-ECU and demand switch connectors. Then, verify the continuity between the following terminals: To program a new key, or a spare, insert it into the slot and set the ignition to ON. Leave the key in for about five seconds, then switch it off. The key information is now stored in the car's computer and the new fob will start your vehicle. You can program any number of fobs you desire 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. You can purchase a brand new keyfob on the internet, but it'll still need to be cut and programmed by an authorized dealer.