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

If you've dropped your key fob on the ground or it stopped working, it's recommended to keep a spare key handy. This article will tell you how to add, alter or reprogramme the Mazda 3 keyfobs.

A word of warning: some keys require programming by a professional locksmith or dealer, whereas other keys do not. Make sure you only use genuine mazda key fobs replacements for your key fob.

How do I add an additional key

You can add a second key if you don't have a spare key, or when you accidentally damage your current one. To accomplish this, you'll require a small screwdriver with a flat head and an CR2025 battery that's new. Once you've got these items then it's time to open the key fob. Locate the key release auxiliary. It's located underneath the metal component and is easy to find. The back cover should slide off when you press the button. Next, place the screwdriver's head into the notch, or the spacing on the top of the metal part and pry it off.

Insert your spare or new key into the slot following the removal of the secondary key. 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 note that you can only program up to three keys for your Mazda 3. The final thing you want is to have more than two functioning key fobs but not be capable of getting your vehicle started. This is a security precaution designed to stop unauthorized users, such as valet drivers, from activating your key and starting your vehicle.

How do I reprogram an unrepaired key

It's smart to know how you can reprogram an extra key in the event that your original key is lost or stolen. This will stop unauthorized persons from opening your car or stealing it. This method should work on any Mazda however you'll need two working keys to begin the process of reprogramming. If you don't have the two working keys, you'll need bring your vehicle to the dealership to have it done.

Begin by stepping into the driver's position, and closing all the doors except the one that is open. Place the first working key in the slot, and then turn the ignition to the ON position. Wait for five seconds, then take the key out and repeat the process with a second key.

After you've programmed your new key, you should have three working keys that you can use to start your car in the future. Test each key to make sure that they're functioning properly before throwing them away.

It is advisable to purchase a spare Mazda 3 remote, especially if your car is prone to problems. You can buy one online or at your local automotive retailer, but make sure to read the reviews before buying so you can avoid getting an item that isn't compatible with your car.

How to change the Battery on a Spare Key

There's nothing worse than finding that the battery on your key fob failed and you are unable to unlock your car. It's easy to replace the battery yourself and save money at the dealership.

The first step is to press the auxiliary button on the back of the key fob. This will release the key's metal cover and reveal two slots on the opposite side of the case. Put the flathead into one of these slots, and then gently pry the two halves apart. Once the battery has been fully exposed, remove the case and place it somewhere that you will not forget it.

Make sure you have a replacement battery prior to beginning. They can be bought from 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.

Then, put the new battery in the correct place and replace the battery cap. Be careful not to scratch the rubber ring on which the battery rests. Finally press the two halves of the key fob together until you hear the sound of a click.

How do you reset the Keyless Entry System

The Mazda 3 key fob is not just a practical feature. It's also 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. The key fob must be reset by the dealer to make it work again. This can be an expensive and frustrating experience, so it's a good idea to learn how to reset the system yourself.

Remove the battery from the system for 15 minutes. This will eliminate any residual power from the on-board computer. The next step is to 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. Leave the key in for around five seconds and then switch off. The information from the key will be transferred to your vehicle's computer and the new fob will be able to start your vehicle in the future. You can program as many fobs as need, but only one should be in use at any particular time. This will stop unauthorised people from copying the key and gaining access to your car. You can buy a new key fob online, but you'll still need to go to a locksmith or dealer in order to cut it and programmed.