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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 has stopped working, it's an excellent idea to keep a spare key on hand. This article will cover everything you need to be aware of changing, adding, and changing the programming of your mazda keyless entry remote 3 key fobs.

A word of caution: some keys require programming by a professional locksmith or dealer, whereas others do not. Be sure to only use genuine Mazda replacements for your key fob.

How to add an extra key

If you're not lucky enough to get a spare key from the dealership when you buy your Mazda 3 or accidentally break your current key do not fret -- there's still an option to get another key. To accomplish this, you'll require an inexpensive flathead screwdriver as well as the new CR2025 batteries. Once you've got the tools then it's time to open the key fob. First find the auxiliary key release button. The button is on the underside of the metal portion. It's easy to locate. When you hit the button, the cover should fall off right away. Next, insert the head of the screwdriver into the notch or spacing at the top of the metal part and pull it off.

Insert your spare key or a new one into the slot after taking out the accessory key. Switch the ignition 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 know that you can only program up to three keys on your Mazda 3. You don't want to utilize more than two key fobs in order to start your car. This is a security measure designed to stop unauthorized users, like valet drivers from activating your key and thereby launching your vehicle.

How to Reprogram a Spare Key

If you have a spare key it's best to be aware of how to program it if your original key gets lost or stolen. This will stop unauthorized persons from starting your car, or stealing it. This will work with any mazda key code. You will need two keys that are working to start the reprogramming process. If you don't have the two working keys, you'll need take your vehicle to the dealership to complete the process.

Begin by stepping into your driver's seat and closing the door, except for the one that's opened. Place the first working key in the slot, then turn the ignition to ON. Wait five seconds before removing the key. Repeat with the second key.

After programming your new key, you should have three keys that start your car in the future. Before storing each key, make sure it's working properly.

You should think about buying an extra Mazda 3 remote, especially if your car is prone to issues. You can purchase one online or at your local automotive store, but make sure to read reviews before buying so you aren't buying the wrong key fob compatible with your vehicle.

How do I change the battery on a spare key

It's depressing to find out that the key fob you used to use has gone out, and you are locked out of 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 take out the metal auxiliary key and expose a slot on both sides of the case. Press the flathead into one of these slots and then gently pry the two halves apart. When the battery is completely exposed, take it out and place the case in a place where you will not forget it.

Be sure to have an extra battery in place prior to starting. These batteries can be purchased from any store that sells batteries or from a Mazda dealer in Winter Garden. Using the right type of battery will ensure that your key fob functions correctly.

Replace the cap on the battery and then insert the new battery. Be careful not to scratch the small rubber ring that the battery sits on. Press the two halves together until you can hear the click.

How do I reset the Keyless Entry System

The mazda 3 key replacement cost 3 key fob is not just a convenient feature. It's also a security feature. If you lose your key or have it stolen, the car will not start even if it has the spare key fob. The key fob needs to be reprogrammed by the dealer to make it work again. This can be a costly and frustrating ordeal, so it's a good idea to understand how to reset the system yourself.

Disconnect the battery from the system for 15 minutes. This will eliminate any residual electric current from the onboard computer. Next, disconnect both the LF-ECU connector as well as the demand switch connectors. Then, verify the continuity between the following terminals:

To program a new key, or a spare, insert it into the slot and turn the ignition to ON. Turn off the ignition after approximately five minutes. The key information will now be transferred to your vehicle's computer, and the new fob will be able start your vehicle in the future. You can program up to three fobs, but you should only use one at one time. This stops unauthorized individuals from copying the key and gaining access to your vehicle. You can buy a new key fob on the internet, but you'll still have to visit an expert locksmith or dealer to cut it and get it programmed.