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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIf you've dropped your key fob on the ground or it stopped working, it's recommended to keep a spare key handy. This article will tell you how to add, change or reprogramme the Mazda 3 keyfobs.Warning: Some keys require programming from a professional locksmith, while others don't. Be sure to only use genuine Mazda replacements for your key fob.How to Add a Spare KeyYou can add an additional key in case you don't have a spare key or if you accidentally break your current one. To do this, you'll need an incredibly small screwdriver, a flathead screwdriver, and a new 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 on the underside the metal part. mazda 2 spare key to locate. 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 the space at the top of the metal piece and pull it away.Insert your spare key or a new one into the slot following the removal of the additional key. Set the ignition to ON and wait for about 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'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 able to get your car started. This is a safeguard to prevent unauthorized users from activating your keys and then starting your car.How to reprogram an unrepaired key?It's a smart idea to know how to reprogram an extra key in the event that your original key becomes lost or stolen. This will stop unauthorised people from taking your car and then starting it. This procedure should work with any Mazda but you'll need two working keys to begin the reprogramming process. If you don't have two working keys, you'll need take your vehicle to a dealer to get it done.Begin by putting yourself in the driver's seat and close the door, with the exception for the one that's already opened. Put the first working key into the slot, and then set the ignition to ON. Take five seconds before removing the key. Repeat with the second key.Once you've finished programming 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.You should consider buying an extra Mazda 3 remote, especially in cases where your car is prone to problems. You can purchase one online or at a local automotive store. Make sure to read reviews before purchasing to ensure that you don't purchase one that's not compatible with your car.How to change the battery on a spare key?There's nothing worse than finding that the battery in your key fob has failed and you are unable to unlock your vehicle. It's easy to change the battery yourself and save money at the dealer.The first step is to press the auxiliary key button on the back of the key fob. This will take out the key's metal cover and reveal two slots on the opposite side of the case. Insert the flathead screwdriver into one of these slots, and gently break the two parts of the case. Once the battery is fully exposed, take it out of the case and put it in a place where you won't forget about it.Before you begin, be sure that you have a new replacement battery. They can be found at any retailer that sells batteries or at a Mazda dealer near Winter Garden. Using the right type of battery will ensure that your key fob functions perfectly.Then, place the new battery into place and replace the battery cap. Be careful not to damage the rubber ring that holds the battery. Press the two halves together until you hear the click.How to reset a Keyless Entry SystemThe Mazda 3 key fob is not just a convenience. It's also a security measure. The car won't start if the key is lost or stolen, even if you've got a spare key fob. This is because the fob that you have to be reprogrammed at the dealership to work once more. It can be a costly and frustrating ordeal, so it's a good idea to understand how to reset the system yourself.Remove the battery from the system for 15 minutes. This will take out any remaining electricity in the on-board computer. Then, disconnect the LF ECU and demand switch connectors. Verify the continuity between the next terminals.To program a new key, or a spare, place it in the slot and set the ignition to ON. The ignition should be turned off after about five seconds. The key's information will be saved to your car's computer, and the new fob will be able to start your car in the future. You can program as many fobs as need however only one must be used at any given time. This prevents unauthorized people from copying your key and getting ahold of your car. You can purchase a brand new keyfob from the internet, however it'll still need to be cut and programmed by an authorized dealer.