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

It's a good idea always to keep an extra key in your pocket no matter if you've dropped your keyfob or it has stopped working. This article will provide everything you must learn about the process of adding, changing, and changing your Mazda 3 key fobs.

Certain keys require programming by an expert locksmith, while others do not. Be sure to only make use of official Mazda replacements for your key fob.

How do you add a spare key

You can also add another key in the event that you don't have a spare key, or in the event that you break the one you already have. To accomplish this, you'll need an incredibly small screwdriver, a flathead screwdriver, and an updated CR2025 battery. Once you've got the tools you need, it's time to open the key fob. First find the key release button for the auxiliary key. It's located under the metal component and is easy to find. The cover on the back should fall off when you press the button. Then, place the screwdriver's tip into the notch on top or the space and take the metal part away.

After the auxiliary key has been removed, insert the new or spare key into the slot. Set the ignition to ON, and wait about five seconds before turning it to off. This will register the new key's information to the system, allowing it to start your car in the future.

It's important to note that you can only program up to three keys on your Mazda 3. The last thing you want is to have more than two working key fobs but not be able to get your car started. This is a safety precaution designed to stop unauthorized users, like valet drivers, from activating your key and starting your car.

How to Reprogram a Spare Key

It's a good idea 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 stealing your car and starting it. This process is compatible with any Mazda however, you'll require two working keys to begin the reprogramming. If you don't have two functioning keys, you'll need take your vehicle to the dealership to have it done.

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

After programming your new key, you should have three keys that work to start your car in the near future. Test each key to ensure sure that they're working properly before taking them off.

It's a good idea purchase a spare Mazda 3 key fob, especially if you're a driver who frequently loses their key or has other issues with it. It's possible to find one on the internet or at your local automotive store, but make sure to read reviews before purchasing so that you aren't buying the wrong key fob compatible with your vehicle.

How to Change the Battery on a spare key

There's nothing worse than finding that the battery on your key fob died and you can't unlock your vehicle. It's easy to replace the battery yourself and save money at the dealer.

The first step is to press the auxiliary key button located on the back of the key fob. This will release the metal key and reveal the slots on both sides of the case. Put the flathead screwdriver in one of these slots and then gently pry apart the two sides of the case. When the battery is completely exposed, remove it and place it in a safe place somewhere safe from being lost.

Be sure to bring an extra battery in place before you begin. You can purchase them at any retailer that sells batteries or at an Mazda dealer close to Winter Garden. The correct battery is vital to ensure that your keyfob is working properly.

Replace the battery cap and then install the new battery. Be careful not to scratch the small rubber ring the battery sits on. Finally, press the two parts of the key fob together until you hear the sound of clicking.

How can I reset the Keyless Entry System

The key fob in your Mazda 3 is not only an added convenience, but it's also an important security feature. If you lose your key, or have it stolen, the car will not start, even if you have the spare key fob. The key fob must be reprogrammed by a dealer to enable it to function again. This could be a costly and frustrating ordeal and 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 erase any residual electricity in the on-board computer. Then, disconnect the LF -ECU and demand switch connectors. Check for continuity between the terminals.

To program a new key, or a spare, place it in the slot and set the ignition to ON. Switch off the ignition after approximately five minutes. The key's information is added to the vehicle's computer and the new fob is able to start your vehicle. You can program as many fobs as would like however only one must be used at any particular time. This prevents unauthorized people from copying the key and getting ahold of your car. You can purchase a new key fob on the internet, but you'll need to visit a dealer or locksmith to cut it and get it programmed.