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

It's a good idea always to keep an extra key at hand regardless of whether you lost the keyfob you were using or it stopped working. This article will provide everything you must know about changing, adding, and programming your Mazda 3 key fobs.

Note: Some keys require programming by an experienced locksmith, whereas others do not. Be sure to only use genuine Mazda replacements for your key fob.

How do I add a spare key?

You can add another key in the event that you don't have a spare key, Mazda 3 Spare Key or when you accidentally damage the one you already have. You'll need the flathead screwdriver, as well as a new CR2025 battery. Once you've got these items you can open up the key fob and replace the battery. First look for the button that allows you to release the key. It's located under the metal piece and is easy to locate. Once you hit the button, the back cover should fall off right away. Then, you can insert the screwdriver head into the notch at the top or into the space and take the metal part away.

Once 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 start your vehicle in the future.

It's important to know that you can only program up to three keys for your Mazda 3. You don't want to have to utilize more than two key fobs in order to start your car. This is a safeguard to stop unauthorised users from activating your keys and launching your vehicle.

How to reprogram an unrepaired key?

If you have a spare key, it's best to know how to program it if your original key is lost or stolen. This will keep unauthorized people from abusing your vehicle and re-starting it. This process should work on any mazda replacement keys but you'll need two keys working to begin the process of reprogramming. If you don't own two working keys, you'll have to bring your car to the dealership to complete the process.

Start by stepping into the driver's seat, close all the doors with the exception of the one that is open. Put the first working key into the slot, and then set the ignition to the ON position. After five seconds, remove the key. Repeat the process with the second key.

After you've completed programming your new key, you should have three working keys that you can use to start your vehicle in the future. Test each key to be sure that they're operating correctly before placing them away.

It is advisable to purchase a spare Mazda 3 remote, especially when your car is susceptible to issues. You can buy one online or at your local automotive store, but make sure to read reviews before purchasing so that you can avoid purchasing the wrong key fob compatible with your car.

How do I change the battery on a Spare Key

There's nothing more frustrating than finding that the battery in your key fob has died and you can't unlock your car. It's a good thing that it's simple to replace the battery and save yourself some cash at the dealership.

Press the auxiliary key button on the back of the keyfob. This will take out the metal key and reveal two slots on the opposite side of the case. Place the flathead in one of these slots and then gently pull the two halves of the case apart. When the battery is fully exposed, remove the case and place it somewhere you will not forget about it.

Be sure to bring a new battery ready before you start. They can be found at any retailer that sells batteries or at a Mazda dealer near Winter Garden. The correct type of battery is essential to ensure that your keyfob works properly.

Replace the battery cap and then install 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 a click.

How to Reset a Keyless Entry System

The key fob in your Mazda 3 is not only an extra convenience, but also an important security feature. The car will not start if your key is lost or stolen even if you have an extra key fob. This is because the key fob has to be reprogrammed by the dealership to function properly. It can be a frustrating and expensive ordeal. Therefore, it's advisable to learn how to reset the system.

To reset the system, disconnect the battery for around 15 minutes. This will remove any residual electrical power in the on-board computer. Then, disconnect both connectors for the LF-ECU and the demand switch connectors. Check continuity between the following terminals.

Place the key in the slot, then turn the ignition ON. Keep the key in place for around five seconds and then switch it off. The key information is now added to the vehicle's computer and the new fob is able to start your vehicle. You can program up to three fobs, but you must only use one at one time. This will stop unauthorised people from copying the key and gaining access to your car. You can purchase a brand new keyfob online, but it will still need to be cut and programmed by a dealer.