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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 simply stopped working, it's a good idea to have an extra key available. This article will show you how to add, alter, and reprogramme your Mazda 3 keyfobs.

A word of caution Certain keys require programming by a professional locksmith or dealer, while others don't. Use only authentic Mazda replacements to replace your key fob.

How to Add a Spare Key

If you're unable to receive a spare key from the dealership when you purchase your Mazda 3 or accidentally break your current key but don't worry, there is still the option of adding another key. You'll need the flathead screwdriver, as well as a new CR2025 battery. Once you have these items you can access the key fob and replace the battery. First find the button that allows you to release the key. The button is on the underside the metal part. It's easy to locate. When you press the button, the back cover should slide off immediately. Then, insert the screwdriver's head into the notch, or the spacing on the top of the metal piece and pull it away.

After the auxiliary keys are removed, insert the new or spare key into the slot. Set the ignition ON and wait for approximately five seconds, and then turn it to off. This will allow the system to recognize the new key and begin your vehicle in the future.

mazda key replacement cost to note that you can only program up to three keys on your Mazda 3. The most important thing is to have more than two functioning key fobs but not be capable of getting your vehicle started. This is a security measure that is designed to block unauthorized users, like valet drivers, from activating your key and thereby starting your car.

How to Reprogram a spare key

If you have a spare key it's important to be aware of how to program it if your original key gets lost or stolen. This will prevent unauthorized people from starting your vehicle or stealing it. This process should work on any Mazda however, you'll require two working keys to start the reprogramming process. If you don't have two functioning keys, you'll have to take your vehicle to the dealer to get it done.

Start by stepping into driver's seat, shutting all doors, with the exception of the one that is open. Insert the first working key into the slot, and then turn the ignition to ON. For five seconds, remove the key and repeat the process with a second key.

Once you've completed programming your new key, you'll have three keys that allow you to start your vehicle in the future. Test each key to be sure that they're working properly before putting them away.

It's a good idea purchase an extra Mazda 3 key fob, especially if your car is one who often loses your key or has other issues with it. You can purchase one on the internet or at your local auto store. Make sure to look up reviews before you purchase to ensure that you don't purchase an item that isn't compatible with your vehicle.

How do I change the battery on a spare key?

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

Press the auxiliary button on the back of the keyfob. This will release the key's metal cover and reveal an opening 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 has been fully exposed, take it out of the case and put it in a spot where you'll never forget about it.

Be sure to have an extra battery in place before you begin. These batteries can be purchased at any store that sells batteries or from a Mazda dealer in Winter Garden. The right kind of battery is crucial to ensure that your key fob functions properly.

Replace the battery cap and then insert the new battery. Be careful not to scratch the rubber ring on which the battery rests. Then press the two halves of the key fob together until you hear a click.

How do you reset the Keyless Entry System

The Mazda 3 key fob is not just a practical feature. It also serves as a security measure. If you lost your key or had it stolen the car won't start, even if you have the spare key fob. The key fob has to be reset by the dealer to enable it to function again. It's a difficult and costly ordeal. Therefore, it's advisable to learn how you can reset the system.


Disconnect the battery from the system for 15 minutes. This will eliminate any residual electric current from the onboard computer. Then, disconnect the LF ECU and demand switch connectors. Check continuity between the following terminals.

To program a new key, or a spare, place it in the slot and set the ignition to ON. The key should remain in the ignition for about five seconds, then switch it off. The key's information will be added to the vehicle's computer, and the new fob will be able start your vehicle in the future. You can program as many fobs as you want however only one should be utilized at any given time. This will prevent unauthorized persons from copying the key and getting ahold of your car. You can purchase a brand new key fob online, but you'll still have to visit an expert locksmith or dealer to cut it and get it programmed.