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

If you've dropped your key fob on the floor or it just stopped working, it's always a good idea to have an extra key available. This article will explain everything you should know about the process of adding, changing, and reprogramming your Mazda 3 key fobs.

A word of warning Certain keys need to be programmed by a locksmith professional or dealer, whereas others do not. Make sure you only use official Mazda replacements for your key fob.

How to add an additional key

If you're not fortunate enough to receive a spare keys from the dealer when you buy your Mazda 3 or accidentally break the one you have, don't worry -- there is still the option of adding another key. To accomplish this, you'll require a small screwdriver with a flat head and an CR2025 battery that's new. Once you've got the tools then it's time to open the key fob and replace the battery. Find the auxiliary key release. The button is located on the underside of the metal portion. It's easy to locate. The back cover should come off the moment you press the button. Then, you can insert the screwdriver's head into the notch on top or the space and pry the metal part off.

Once the auxiliary key has been removed, insert the new or spare key into the slot. Set the ignition to ON, and wait for around five seconds before setting it to off. This will allow the system to recognize the new key and start your vehicle in the future.

It is important to remember that you can only program up to three keys for your Mazda 3. The most important thing is to have more than two working key fobs and not be capable of getting your vehicle started. This is a safety measure that is designed to block unauthorized users, like valet drivers who are not authorized to use your key and starting your car.

How do I reprogram an unrepaired key

It's smart to know how you can reprogram a spare key in the event that your original key becomes lost or stolen. This will stop unauthorized persons from starting your vehicle or stealing it. This should work with any Mazda. You will need two keys that are working to begin the reprogramming process. If you don't have two keys that function, you should take your car to a dealer to have this completed.

Begin by stepping into the driver's seat, close all the doors with the exception of the one that is open. Insert the first working key in the slot, and then set the ignition to ON. Wait five seconds before removing the key. Repeat with the second key.

After you've programmed your new key, you'll have three keys that you can use to start your vehicle in the future. Before you store each key, make sure it's functioning correctly.

You should think about purchasing a spare Mazda 3 remote, especially when your car is susceptible to issues. You can buy one online or at your local automobile store, but be sure to read the reviews before buying so that you aren't buying an item that isn't compatible with your car.

How do you change the battery on a spare key?

There's nothing worse than discovering that the battery in your key fob has gone out and you're not able to unlock your vehicle. Fortunately, it's easy to replace the battery and save yourself some cash at the dealership.

The first step is to press the auxiliary key button on the back of the key fob. This will remove the metal auxiliary key and expose two slots on the sides of the case. Place the flathead in one of these slots, and then gently pry the two halves apart. When the battery is completely exposed, remove it and set aside the case in a place where you will not forget it.

Make sure you have a replacement battery prior to beginning. They can be found at any retailer that sells batteries or at an Mazda dealer near Winter Garden. Choosing the right battery will ensure that your key fob works 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 rests on. Finally, press the two parts of the key fob together until you hear the sound of clicking.

How to reset the system's Keyless Entry System

The Mazda 3 key fob is not just a practical feature. It also serves as an important security feature. If you lost your key or had it stolen, the car will not start even if you have the spare key fob. The key fob should be reprogrammed by the dealer to make it work again. mazda 6 car key replacement can be an expensive and frustrating ordeal therefore it's a great idea to learn how to reset the system yourself.


Disconnect the battery from the system for 15 minutes. This will eliminate any remaining electricity from the onboard computer. The next step is to disconnect the LF-ECU and demand switch connectors. Check for continuity between the following terminals:

To program the new key or spare, place it in the slot and turn the ignition to ON. Turn off the ignition after approximately five minutes. 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 must only use one at a time. This prevents unauthorized 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 visit an expert locksmith or dealer to cut it and get it programmed.

Website: https://www.autokeys-r-us.co.uk/mazda/