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

Whether you dropped your key fob on the floor or it has stopped working, it's always a good idea to have a spare key handy. This article will explain everything you need to learn about changing, adding, and changing the programming of your Mazda 3 key fobs.

Note: Some keys require programming from an expert locksmith, while others do not. Only use authentic Mazda replacements to replace your key fob.

How to Add a Spare Key

You can add an additional key in case you don't have a spare key available or if you accidentally damage your existing one. To accomplish this, you'll require a small screwdriver with a flat head and the new CR2025 batteries. Once you have the items and tools, you're ready to open the key fob. Find the auxiliary key release. It's located beneath the metal portion. It's easy to locate. The back cover should come off the moment you press the button. Then, place the screwdriver's head in the notch at the top or in the space, and remove the metal part.

Insert your spare or new key into the slot following the removal of the accessory key. Set the ignition to ON and wait about five seconds before setting it to off. This will allow the system to recognize the new key and begin your vehicle in the future.

It is only possible to program three keys into your Mazda 3. You don't want to have to utilize more than two key fobs to start your car. This is a security measure to stop unauthorized users from activating your keys and starting your vehicle.

How to Reprogram a spare key

If you have a spare key, it's best to know how to reprogram it in case your original key gets lost or stolen. This will stop unauthorised people from starting your car, or stealing it. This process should work on any Mazda but you'll need two keys working to begin the reprogramming process. If you don't have two working keys, you'll need take your vehicle to the dealership to have it done.

Begin by stepping into the driver's seat, shutting all doors, with the exception of the one that is open. Set the ignition to ON and insert the initial working key. Take five seconds before removing the key. Repeat the process with the second key.

After programming your new key, you'll have 3 keys that work to start your vehicle in the future. Before you store each key, make sure it's working properly.

You should think about purchasing an extra Mazda 3 remote, especially when your car is susceptible to issues. You can purchase one online or in your local auto store. Be sure to go through reviews prior to purchasing to ensure that you don't get an item that isn't compatible with your car.

How do you change the battery with a spare key?

It's awful to discover that the key fob you used to use has gone out and you're in a position to not unlock your car. Fortunately, it's easy to replace the battery and save yourself some money at the dealership.

Press the auxiliary key button located at the back of the keyfob. This will release the metal auxiliary key and expose two slots on the sides of the case. Use the screwdriver's flathead to push it into one of these slots and gently pry apart the two halves of the case. When the battery is fully exposed, remove the case and put it somewhere you will not forget it.

Make sure you have a new battery ready prior to starting. They are available at any store that sells batteries or at an mazda key cut dealer near Winter Garden. The correct battery is essential to ensure that your keyfob works correctly.

Then, put the new battery into place and replace the cap on the battery. Be careful not to damage the rubber ring that holds the battery. The two halves should be pressed together until you hear the click.

How to Reset a Keyless Entry System

The Mazda 3 key fob is not just a practical feature. It also serves as a security feature. If you lose your key or have it stolen the car won't start even if you have the spare key fob. This is because the key fob needs to be reset at the dealership to work properly. It can be a frustrating and costly ordeal. Therefore, it's advisable to learn how to get a new mazda key fob to reset the system.

Remove the battery from the system for 15 minutes. This will remove any residual electricity from the onboard computer. Then, disconnect the LF ECU and demand switch connectors. Then, verify the continuity between the following terminals:

Place the key in the slot and turn on the ignition. The key should remain in the ignition for around five seconds and then turn off. The key's information is transferred to the computer of your vehicle and the new fob can start your vehicle. You can program as many fobs as you desire but only one can be utilized at any specific time. This prevents unauthorized people from copying the key and getting ahold of your car. You can purchase a replacement keyfob from the internet, however it'll still need to be cut and programmed by a dealer.