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

If you've dropped your key fob on the floor or it simply stopped working, it's recommended to keep a spare key on hand. This article will go over everything you must learn about adding, changing, and programming your Mazda 3 key fobs.

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

How do you add an extra key

You can add a second key if you don't have a spare key available or if you accidentally break your existing one. To accomplish this, you'll require an inexpensive flathead screwdriver as well as an updated CR2025 battery. Once you've got the tools, it's time to open up the key fob and swap the battery. Find the key release auxiliary. It's located on the bottom of the metal portion. It's easy to locate. The cover on the back should fall off as soon as you press the button. Then, insert the screwdriver's head into the notch on top or the space, and take the metal part away.

Insert your spare or new key into the slot after removing the secondary key. Set the ignition to ON and wait for around 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 keep in mind that you can only program up to three keys for your Mazda 3. You don't want to utilize more than two key fobs to start your vehicle. This is a security precaution that is designed to block unauthorized users, like valet drivers from activating your key and starting your vehicle.

How to Reprogram a spare key

It's a good idea to be aware of how to reprogram a spare key in the event that your original key becomes lost or stolen. This will stop unauthorised people from opening your car or stealing it. This process is compatible with any Mazda however you'll need two keys that work to begin the process of reprogramming. If you don't have two keys that function, you should take your Mazda to a dealer to have this completed.

Begin by getting into your driver's seat, and close the door, except for the one that's already opened. Set the ignition to ON and insert the initial working key. For five seconds, take the key out and repeat the process with the second key.

After you finish programming your new key you should have 3 keys that be able to start your vehicle in the future. Before placing each key in storage, make sure it's working properly.

It's a good idea to buy an extra Mazda 3 key fob, especially if your car is one who has a tendency to lose their keys or has other issues with it. You can purchase one online or in your local auto store. Make sure to read reviews before purchasing so that you don't get an item that isn't compatible with your vehicle.

How to Change the Battery on a spare key

There's nothing worse than finding that the battery in your key fob has been damaged and you're unable to unlock your vehicle. It's simple to replace the battery yourself and save money at the dealership.

Press the auxiliary button on the back of the keyfob. This will detach the metal key and reveal a slot on each side of the case. Place the flathead in one of these slots and then gently pry the two halves apart. Once the battery is fully exposed, remove the case and put it somewhere that you will not forget it.

Before you begin, make sure that you have a brand new replacement battery. They can be bought from any store that sells batteries or from a Mazda dealer in Winter Garden. The right type of battery is essential to ensure that your keyfob works properly.

Replace the cap on the battery and then put in the new battery. Be careful not damage the rubber ring on which the battery rests. Then, press the two halves of the key fob until you hear an audible click.

How do I reset a Keyless Entry System

The Mazda 3 key fob is not just a practical feature. It's also an element of security. If you lose your key or had it stolen the car won't start, even if you have the spare key fob. This is because the key fob needs to be reprogrammed at the dealership to work again. This can be an expensive and time-consuming process It's a good idea to understand how to reset the system yourself.

Remove the battery from the system for 15 minutes. This will eliminate any residual electric current from the onboard computer. Then, disconnect both the LF-ECU connector as well as the demand switch connectors. Verify that the connections are in good order between the terminals.

To program a new key or a spare, insert it into the slot and turn the ignition to ON. Put the key in for about five seconds and then turn it off. The key's details will be transferred to your vehicle's computer and the new fob will be able to start your vehicle in the future. You can program as many fobs as would like but only one can be used at a given time. This will keep unauthorised individuals from stealing your keys and gaining access to your vehicle. You can purchase a brand new key fob online, but you'll still have to visit an authorized locksmith or dealer to cut it and programmed.