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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIt’s a good idea always to have an extra key in your pocket no matter if you’ve dropped the keyfob or it stopped working. This article will provide everything you need to be aware of changing, adding, and changing the programming of your Mazda 3 key fobs.A word of caution: some keys require programming by a locksmith professional or dealer, whereas other keys don’t. Make sure to use genuine Mazda replacements for your key fob.How to add a spare keyYou can also add a second key if you don’t have a spare key available or when you accidentally damage the one you already have. You’ll need to use a flathead screwdriver, and an CR2025 battery. Once you’ve got all the equipment then it’s time to open the key fob. Locate the auxiliary key release. It’s located under the metal piece and is easy to locate. The cover that covers the back should come off the moment you press the button. Next, insert the screwdriver’s head into the notch, or the spacing at the top of the metal component and pull it away.Once the auxiliary key is removed, insert your new or spare key into the slot. Switch the ignition on and then wait for around five seconds before turning it to off. This will register the new key’s details to the system that will allow it to start your car in the future.You can only program three keys on your Mazda 3. You don’t want to have to utilize more than two keys to start your vehicle. This is a safety measure designed to stop unauthorized users, like valet drivers who are not authorized to use your key and thereby launching your vehicle.How to reprogram a spare keyIf you have a spare key it’s best to know how to program it if your original key gets stolen or lost. This will stop unauthorised people from starting your car or taking it. This method should work on any Mazda however you’ll need two working keys to start the process of reprogramming. If you don’t have two working keys, you’ll need to take your vehicle to the dealer to get it done.Start by getting into the driver’s seat and shutting all doors, with the exception of the one that is open. Turn the ignition on and then insert the first working key. Take five seconds before removing the key. Repeat the process with the second key.After you’ve programmed your new key, you’ll have three keys that allow you to start your vehicle in the future. Before you store each key, make sure that it’s functioning properly.It is advisable to purchase a spare Mazda 3 remote, especially in cases where your car is prone to issues. You can buy one online or at a local automotive retailer, but make sure to read the reviews prior to purchasing so you aren’t purchasing the wrong key fob compatible with your car.How do mazda key fob replacement cost change the battery on a spare key?It’s depressing to find out that your key fob is dead and you’re in a position to not unlock your vehicle. It’s a good thing that it’s simple to replace the battery and save yourself some money at the dealer.Press the auxiliary button on the back of the keyfob. This will remove the key auxiliary and reveal a slot on both sides of the case. Use the screwdriver’s flathead to push it into one of these slots, and gently break the two sides of the case. Once the battery is fully exposed, remove the case and place it in a place where you won’t forget about it.Be sure to have a new battery ready prior to starting. You can find these at any store that sells batteries or at a Mazda dealer near Winter Garden. Choosing the right battery will ensure that your key fob operates correctly.Then, place the new battery into place and replace the battery cap. Be careful not damage the rubber ring on which the battery rests. Press the two halves together until you can hear the click.How do I reset a Keyless Entry SystemThe key fob on your Mazda 3 is not only a convenience, it’s also an important security feature. If you lose your key, or have it stolen the car won’t start even if you’ve got the spare key fob. The key fob needs to be reprogrammed by the dealer to make it work again. It can be a frustrating and costly ordeal. Therefore, it’s best to learn how you can reset the system.To reset the system, unplug the battery for approximately 15 minutes. This will eliminate any remaining electrical power in the on-board computer. The next step is to disconnect the LF-ECU and demand switch connectors. Check for continuity between the following terminals:Place the key into the slot, and turn the ignition ON. The key should remain in the ignition for about five seconds, then switch it off. The key’s information is stored in the car’s computer and the new fob can start your car. You can program as many fobs as you would like but only one can be utilized at any particular time. This will stop unauthorised people from copying your key and gaining access to your car. You can buy a new key fob on the internet, but you’ll still need to go to a locksmith or dealer in order to get it cut and programmed.