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How to Add, Change, and Reprogram a Mazda 3 Spare KeyWhether you dropped your key fob on the floor or it stopped working, it’s a good idea to have a spare key handy. This article will tell you how to add, change and re-programme your Mazda 3 keyfobs.Certain keys require programming by professional locksmiths, while others do not. Make sure you only use official Mazda replacements for your key fob.How to add an additional keyIf you’re not lucky enough to find a spare key from the dealer when you purchase your Mazda 3 or accidentally break your current one, don’t worry — there’s still the option of adding another key. To accomplish this, you’ll need an incredibly small screwdriver, a flathead screwdriver, and an updated CR2025 battery. Once you’ve got these tools and are ready to remove the key fob and change the battery. Find the key release auxiliary. It’s located on the underside the metal portion. It’s easy to find. When you hit the button, the cover should slide off immediately. Then, put the screwdriver’s tip into the notch at the top or in the space, and pull the metal piece off.After the auxiliary keys are removed, insert the new or spare key into the slot. Set the ignition ON and wait for five seconds, then turn it to OFF. This will allow the system to recognize the new key and start your vehicle in the future.You can only program three keys to your Mazda 3. You don’t want to use more than two keys to start your car. This is a safety measure to stop unauthorised users from activating your keys and launching your car.How to Reprogram a spare keyIt’s a smart idea know how you can reprogram a spare key in the event that the original key is lost or stolen. This will prevent unauthorized people from starting your vehicle or taking it. This will work with any Mazda. You’ll need two keys that work to begin the reprogramming. If you don’t own two working keys, you’ll need bring your vehicle to the dealership to have it done.Begin by getting in mazda 2 key replacement , and closing the door, except for the one that’s been opened. Place the working key into the slot, and then turn the ignition to ON. Wait five seconds before removing the key. Repeat the process with the second key.After programming your new key, you should have three keys that work to start your vehicle in the future. Test each key to make sure that they’re functioning properly before throwing them away.It’s a good idea to purchase an extra Mazda 3 key fob, especially if you’re someone who is prone to losing keys or has other issues with it. It’s possible to find one on the internet or at your local automobile store, but make sure to read reviews prior to purchasing so you can avoid getting an item that isn’t compatible with your vehicle.How to change the Battery on a Spare KeyIt’s awful to discover that your key fob is dead and you’re locked out of your vehicle. It’s easy to change the battery yourself and save money at the dealer.Press the auxiliary key button located at the back of the keyfob. 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 then gently take apart the two parts of the case. Once the battery is fully exposed, take it out and place the case somewhere that you won’t forget about it.Before you begin, make sure you have a new replacement battery. You can find these at any store that stocks batteries or at an Mazda dealer close to Winter Garden. Choosing the correct battery will ensure that your key fob functions properly.Next, put the new battery in the correct place and replace the cap on the battery. Be careful not damage the rubber ring that holds the battery. Finally, press the two halves of the key fob together until you hear the sound of a click.How do I reset a Keyless Entry SystemThe 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 won’t start, even if you have the spare key fob. The key fob needs to be reprogrammed by the dealer to allow it to work again. It can be a stressful and costly process. Therefore, it’s best to understand how you can reset the system.To reset the system, unplug the battery for approximately 15 minutes. This will erase any residual electrical power in the on-board computer. Then, disconnect the LF-ECU and demand switch connectors. Verify the continuity between the next terminals.To program the new key or spare, insert it into the slot and set the ignition to ON. Put the key in for around five seconds and then switch it off. The key’s information has been added to the vehicle’s computer and the new fob will start your car. You can program up to three fobs however, you should only use one at each time. This will prevent unauthorized persons from copying the key and gaining access to your car. You can buy a new key fob online, however you’ll still have to visit an authorized locksmith or dealer to get it cut and programmed.