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

Whether you dropped your key fob on the ground or it just stopped working, it's always best to have a spare key on hand. This article will show you how to add, change or reprogramme the Mazda 3 keyfobs.

A word of warning Certain keys require programming by a locksmith professional or dealer, while other keys don't. Be sure to only make use of official Mazda replacements for your key fob.

How to add a spare key

If you're not fortunate enough to get a spare key from the dealer when you purchase your Mazda 3 or accidentally break the one you have do not fret -- there's still a way to add another key. You'll need an flat-head screwdriver and a new CR2025 battery. Once you've got these items then it's time to open the key fob. Locate the key release auxiliary. It's located under the metal part and is easy to find. The back cover should slide off as soon as you press the button. Then, insert the screwdriver's head into the notch at the top or into the space and pry the metal part off.

Insert your spare or new key into the slot after removing the accessory key. Set the ignition to ON, and wait about five seconds before turning it to OFF. This will register the new key's information into the system which will allow it to start your car in the future.

It is only possible to program three keys on your Mazda 3. You don't want to use more than two key fobs to start your car. This is a safety measure to stop unauthorized users from activating your keys and launching your car.

How to Reprogram a spare key

If you have a spare key, it's a good idea to know how to reprogram it in case your original key is stolen or lost. This will stop unauthorised people from starting your car or stealing it. This will work with any Mazda. You'll require two keys that work to begin the reprogramming. If you don't own two keys that work then it's best to bring your car to a dealer to get this completed.

Start by getting into the driver's position and close all the doors with the exception of the one that is open. Set the ignition to ON and insert the first functioning key. Take five seconds before removing the key. Repeat mazda 3 keys with the second key.

Once you've finished programming your new key, you'll have three working keys you can use to start your car in the future. Test each key to make sure that they're functioning properly before taking them off.

It's a good idea purchase an extra Mazda 3 key fob, particularly if you're a driver who has a tendency to lose their keys or has other issues with it. You can find one online or at your local automotive retailer, but make sure to read reviews prior to purchasing so you aren't purchasing one that's not compatible with your vehicle.

How to change the Battery on a Spare Key

It's a nightmare to discover that your key fob has failed, and you are in a position to not unlock your car. It's a good thing that it's simple to replace the battery and save some money at the dealership.

The first step is to press the auxiliary key button on the back of the key fob. This will take out the key's metal cover and reveal two slots on the opposite side of the case. The flathead should be inserted into one of these slots and then gently pry the two halves of the case apart. Once the battery has been fully exposed, remove the case and put it in a spot where you'll never forget about it.

Make sure you have a replacement battery prior to starting. These batteries can be purchased at any retailer that sells batteries or from a Mazda dealer in Winter Garden. Choosing the right battery will ensure that your key fob is working correctly.


Replace the battery cap and then insert the new battery. Be careful not to scratch the rubber ring that holds the battery. The two halves should be pressed together until you hear the click.

How do I reset the system's Keyless Entry System

The Mazda 3 key fob is not just a convenience. It also serves as an important security feature. If you lose your key or had it stolen the car will not start even if you've got the spare key fob. This is because the fob that you have to be reprogrammed by the dealership to function properly. It's a difficult and costly ordeal. Therefore, it's recommended to understand how you can reset the system.

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

Put the key in the slot and turn on the ignition. The key should remain in the ignition for about five seconds, then switch off. The key's details are now stored in the car's computer and the new fob is able to start your car. You can program as many fobs as you desire, but only one should be utilized at any certain time. This stops unauthorized individuals from copying your key and gaining access to your car. You can purchase a replacement keyfob online, however it'll still need to be programmed and cut by a dealer.