20 Myths About Mazda 6 Key: Dispelled 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 always best to have a spare key on hand. This article will go over everything you need to be aware of when changing, adding, and programming your Mazda 3 key fobs.

Be aware that some keys require programming by an experienced locksmith, whereas others do not. Make sure you use only authentic Mazda replacements to replace your key fob.

How do I add an additional key

You can also add a second key if you don't have a spare key, or in the event that you break your current one. To accomplish this, you'll require an inexpensive flathead screwdriver as well as a new CR2025 battery. Once you've got the tools, it is time to open the key fob. Find the auxiliary key release. It's located on the bottom of the metal portion. It's easy to find. When you hit the button, the cover should slide off immediately. Next, insert the head of the screwdriver into the notch or spacing at the top of the metal component and pull it off.

After the auxiliary key has been removed, insert your new or spare key into the slot. Set the ignition to ON and wait about five seconds before turning it to off. This will allow the system to recognize the new key and begin your vehicle in the future.

It is only possible to program three keys into your Mazda 3. You don't want to utilize more than two keys to start your vehicle. This is a safeguard to stop anyone who is not authorized from activating your key fobs and starting your car.

How to Reprogram a spare key

It's smart to be aware of how to reprogram a spare key in the event that your original key is lost or stolen. This will prevent unauthorised persons from getting into your car and causing damage to it. This will work with any Mazda. You will need two keys that are working to begin the reprogramming. If you don't have the two working keys, you'll have to bring your car to the dealership to complete the process.

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

After you've programmed your new key you should have 3 keys that will be able to start your vehicle in the future. Before you store each key, make sure it's functioning correctly.

It's a good idea to buy a spare Mazda 3 key fob, especially if you're a driver who has a tendency to lose their keys or has other issues with it. You can purchase one on the internet or at your local auto store. Be sure to go through reviews prior to purchasing to ensure that you don't purchase one that's not compatible with your car.

How to Change the Battery on a spare key

It's very frustrating to discover that your key fob has failed and you're unable to unlock your vehicle. It's simple to replace 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 detach the key made of metal and reveal an opening on each side of the case. Press the flathead screwdriver into one of these slots. Then, gently pry apart the two sides of the case. When the battery is fully exposed, remove the case and place it somewhere that you will not forget about it.

Before you start, make sure that you have a brand new replacement battery. They are available in any store that sells batteries or at a Mazda dealer near Winter Garden. The right type of battery is crucial to ensure that your key fob functions properly.

Replace the cap on the battery, and then install the new battery. Be careful not to damage the rubber ring on which the battery rests. The two halves should be pressed together until you can hear the click.

How to Reset the Keyless Entry System

The Mazda 3 key fob is not just a practical feature. It's also a security measure. If you lost your key or had it stolen the car will not start even if it has the spare fob. This is because the fob that you have to be reprogrammed by the dealership to work once more. This could be a costly and stressful experience, so it's a good idea to learn how to reset the system yourself.


To reset the system, unplug the battery for 15 minutes. This will eliminate any remaining power from the on-board computer. Then, disconnect the connectors for the LF-ECU and the demand switch connectors. Then, check continuity between the following terminals:

Place the key into the slot and turn the ignition ON. The ignition should be turned off after approximately five minutes. replacement mazda 3 key is now stored in the car's computer and the new fob will start your vehicle. You can program any number of fobs you want but only one can be used at a specific time. This stops unauthorized individuals from copying your key and gaining access to your vehicle. You can purchase a new key fob online, however you'll still need to go to an expert locksmith or dealer to cut it and programmed.