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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIt’s a good idea to have an extra key in your pocket no matter if you’ve dropped the keyfob or it has stopped working. This article will explain everything you need to know about changing, adding, and programming your Mazda 3 key fobs.A word of caution Certain keys need to be programmed by a professional locksmith or dealer, while other keys don’t. Make sure you only use genuine Mazda replacements for your key fob.How to Add a Spare KeyIf you’re not fortunate enough to get a spare key from the dealer when you buy your Mazda 3 or accidentally break the one you have Don’t fret, there is still an option to get another key. You’ll need the flathead screwdriver, as well as a CR2025 new battery. Once you’ve got these tools then it’s time to open the key fob and swap the battery. First look for the button that allows you to release the key. The button is located on the underside the metal portion. It’s easy to find. The cover on the back should fall off the moment you press the button. Next, insert the screwdriver’s head into the notch, or the spacing on the top of the metal component and pry it off.Once the auxiliary key is removed, insert your new or spare key into the slot. 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 on your Mazda 3. You don’t want to have to use more than two key fobs to start your car. This is a safeguard to prevent unauthorized users from activating your keys and then starting your vehicle.How to Reprogram a Spare KeyIt’s a smart idea to learn how you can reprogram a spare key in the event that the original key is lost or stolen. This will stop unauthorised people from starting your vehicle or taking it. This procedure should work with any Mazda however, you’ll require two keys working to begin the reprogramming process. If you don’t have two working keys, you’ll need to take your vehicle to a dealership to have it done.Begin by putting yourself in the driver’s seat, and close the door, with the exception for the one that’s open. Place the first working key in the slot, and then turn the ignition to the ON position. Wait five seconds, then remove the key and repeat with the second key.After you finish programming your new key, you should have 3 keys that work to start your car in the near future. Test each key to make sure that they’re working properly before putting them away.It’s a good idea buy a spare Mazda 3 key fob, particularly if you’re a driver who frequently loses their key or has other issues with it. You can purchase one online or at your local automotive store, but make sure to read reviews before buying so that you aren’t purchasing an item that isn’t compatible with your vehicle.How to Change the Battery on a spare KeyThere’s nothing more frustrating than finding that the battery for your key fob has failed and you are unable to unlock your vehicle. Fortunately, it’s easy to replace the battery and save yourself some money at the dealership.The first step is to press the auxiliary key button located on the back of the key fob. This will take out the metal key and reveal the slots on both sides of the case. Place the flathead in one of these slots and gently pry the two halves of the case apart. Once the battery is fully exposed, remove it and put it away somewhere that you won’t forget about it.Before you begin, be sure that you have a brand new replacement battery. These batteries can be purchased from any store that sells batteries or from a Mazda dealer in Winter Garden. The correct type of battery is essential to make sure that your keyfob functions correctly.Next, put the new battery in the correct place and replace the cap on the battery. Be careful not to scratch the rubber ring that holds the battery. Press the two halves together until you hear a click.How to reset a Keyless Entry SystemThe Mazda 3 key fob is not just a piece of equipment for convenience. It also serves as a security feature. The car will not start if the key is stolen or lost even if you have a spare key fob. This is because the key fob needs to be reset at the dealership in order to work again. mazda 5 key fob ‘s a difficult and costly ordeal. So, it’s best to understand how you can reset the system.Remove the battery from the system for 15 minutes. This will clear any residual electric current from the onboard computer. Then, disconnect the LF-ECU connector and the demand switch connectors. Then, verify the continuity between the following terminals:Place the key into the slot, then switch on the ignition. Put the key in for around five seconds, and then switch it off. The key’s details are now added to the computer in your car and the new fob can start your car. You can program up to three fobs, however, you must only use one at each time. This will stop unauthorized individuals from stealing your key and gaining access to your car. You can buy a new keyfob online, however it will still need to be programmed and cut by a dealer.