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

If you've dropped your key fob on the ground or it has stopped working, it's best to have a spare key on hand. This article will go over everything you need to know about changing, adding, and programming your Mazda 3 key fobs.

A word of warning Some keys require programming by a locksmith professional or dealer, while other keys don't. Make sure you only use genuine Mazda replacements for your key fob.

How to add a spare key

You can add an additional key if you don't have a spare key, or if you accidentally break your existing one. To do this, you'll need a small flathead screwdriver and a new CR2025 battery. Once you've got all the equipment, it is time to open the key fob. Locate the auxiliary key release. It's located on the underside of the metal portion and is easy to find. The cover that covers the back should come off when you press the button. Next, insert the screwdriver's head into the notch or the space on the top of the metal component and pull it off.

Insert your spare or new key into the slot after removing the accessory key. Set the ignition to ON and wait for about 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's important to note that you can only program up to three keys on your Mazda 3. You don't want to utilize more than two keys to start your vehicle. This is a safety precaution that is designed to block unauthorized users, such as valet drivers, from activating your key and thereby starting your car.

How do I reprogram a spare key?

It's a smart idea know how you can reprogram a spare key in the event that your original key is lost or stolen. This will keep unauthorized people from taking your car and then starting it. This process is compatible with any Mazda but you'll need two keys that work to begin the reprogramming. If you don't own two working keys, you should take your car to a dealer to have this done.

Start by stepping into driver's position and shutting all doors, with the exception of the one that is open. Insert the first working key in the slot, and then set the ignition to the ON position. Wait five seconds, then remove the key and repeat the procedure with the second key.

After you've programmed your new key, you'll have three keys that will start your vehicle in the future. Before storing each key, make sure that it's working correctly.


You should think about purchasing a spare Mazda 3 remote, especially if your car is prone to issues. You can find one online or at your local automobile store, but make sure to read the reviews before buying so you can avoid purchasing one that's not compatible with your vehicle.

How do I change the battery on a spare Key

There's nothing more frustrating than discovering that your key fob battery has failed and you are unable to unlock your vehicle. It's easy to change the battery yourself and save money at the dealer.

Press the auxiliary key button on the back of the keyfob. This will remove the metal auxiliary key and expose slots on both sides of the case. The flathead should be inserted into one of these slots, and then gently pull the two halves of the case apart. When the battery is completely exposed, take it out and put it away somewhere you won't forget it.

Before mazda car keys start, make sure that you have a brand new replacement battery. They can be bought at any retailer that sells batteries or from a Mazda dealer in Winter Garden. The correct battery is crucial to make sure that your keyfob functions correctly.

Then, put the new battery in the correct place and replace the cap on the 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 to Reset a Keyless Entry System

The key fob that you have in your Mazda 3 is not only an option for convenience, it's an important security feature. The car will not start if your key is lost or stolen, even if you've got a spare key fob. The key fob must be reset by the dealer to make it work again. It can be a stressful and expensive ordeal. Therefore, it's best to understand how you can reset the system.

Remove the battery from the system for 15 minutes. This will eliminate any residual power from the on-board computer. Then, disconnect the LF-ECU connector as well as the demand switch connectors. Check continuity between the following terminals.

To program the new key or spare, insert it into the slot and turn the ignition to ON. The key should remain in the ignition for around five seconds, and then switch it off. The key's information has been transferred to the computer of your vehicle and the new fob can start your vehicle. You can program as many fobs as you would like, but only one should be used at any given time. This prevents unauthorized people from copying the key and getting ahold of your car. You can buy a new key fob online, however you'll still need to go to an expert locksmith or dealer to get it cut and programmed.

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