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How to Add, Change, and Reprogram a Mazda 3 Spare Key

Whether you dropped your key fob on the floor or it just stopped working, it's recommended to keep a spare key handy. This article will go over everything you should be aware of when adding, changing, or changing the programming of your Mazda 3 key fobs.
https://www.thekeylab.co.uk/mazda-car-keys/ of caution Some keys require programming by a professional locksmith or dealer, whereas other keys don't. Make sure you only use genuine Mazda replacements for your key fob.

How do I add a spare key?

You can add a second key if you don't have a spare key available or if you accidentally damage the one you have. You'll need to use a flathead screwdriver and an CR2025 battery. Once you have these items, it's time to open the key fob and replace the battery. First look for the button that allows you to release the key. It's located underneath the metal portion and is easy to find. The cover on the back should fall off as soon as you press the button. Then, you can insert the screwdriver's head into the notch or spacing on the top of the metal component and then pull it off.

Insert your spare key or a new one into the slot after you have removed the accessory key. Turn the ignition on and then wait for around five seconds, and then turn it to OFF. This will add the new information on the key to the system which 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 use more than two key fobs to start your vehicle. This is a safety precaution that is designed to block unauthorized users, such as valet drivers from activating your key and starting your car.

How to reprogram an unrepaired key?

It's a smart idea be aware of how to reprogram a spare key in the event that your original key is lost or stolen. This will stop unauthorised people from starting your car, or taking it. This process should work on any Mazda but you'll need two working keys to begin the reprogramming. If you don't own two keys that work, you should take your car to a dealer to have this completed.

Begin by getting in your driver's seat and shutting the door, excluding for the one that's open. Place the first working key in the slot, then turn the ignition to the ON position. Then wait five seconds before taking out the key. Repeat with the second key.

After you finish programming your new key, you should have 3 keys that allow you to start your car in the future. Before you store each key, make sure it's working properly.

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It's a good idea to buy an extra Mazda 3 key fob, particularly if you're a driver who is prone to losing keys or has other issues with it. You can find one online or at a local automotive store, but be sure to read reviews prior to purchasing so you can avoid purchasing a key fob that's not compatible with your car.

How to Change the Battery on a spare Key

There's nothing worse than discovering that the battery on your key fob been damaged and you're 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 that is located on the back of the key fob. This will remove the key auxiliary and reveal an opening on both sides of the case. Insert the flathead screwdriver into one of these slots and gently pry apart the two halves of the case. Once the battery is fully exposed, take it out and set aside the case somewhere you won't forget it.

Be sure to bring a new battery ready before you start. These batteries can be purchased at any store that sells batteries or from a Mazda dealer in Winter Garden. Choosing the correct battery will ensure that your key fob is working effectively.

Next, put the new battery into place and replace the cap on the battery. Be careful not to damage the rubber ring on which the battery rests. Then, press the two parts of the key fob until you hear a click.

How to Reset the Keyless Entry System

The Mazda 3 key fob is not just a convenient feature. It also serves as an element of security. If you lose your key or had it stolen the car won't start even if you've got the spare key fob. The key fob must be reprogrammed by a dealer to make it work again. It can be a costly and frustrating experience It's a good idea to understand how to reset the system yourself.

To reset the system, disconnect the battery for about 15 minutes. This will remove any residual electricity in the on-board computer. Then, disconnect the LF ECU and demand switch connectors. Verify the continuity between the next terminals.

Place the key into the slot, then turn the ignition ON. Switch off the ignition after about five seconds. The key's information has been added to the computer in your car and the new fob is able to start your vehicle. You can program up to three fobs, however, you should only use one at a time. This prevents unauthorized people from copying the key and getting ahold of your vehicle. You can buy a new keyfob online, but it will still need to be programmed and cut by a dealer.