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

If you've dropped your key fob on the floor or it simply stopped working, it's always recommended to keep a spare key on hand. This article will go over everything you need to be aware of adding, changing, or programming your Mazda 3 key fobs.

Note: Some keys require programming by professional locksmiths, while others don't. Make sure to use official Mazda replacements for your key fob.

How do I add a spare key?

If you're not lucky enough to receive a spare keys from the dealer when you purchase your Mazda 3 or accidentally break the one you have do not fret -- there's still the option of adding another key. You'll need a flathead screwdriver and an CR2025 battery. Once you have the items and tools, you're ready to open the key fob. Find the key release auxiliary. It's on the underside of the metal portion and is easy to locate. The cover on the back should fall off as soon as you press the button. Next, insert the head of the screwdriver into the notch, or the spacing on the top of the metal part and pull it off.

Once the auxiliary key is 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 register the new key's information into the system that will allow it to start your vehicle in the future.

You can only program three keys to your Mazda key programming 3. You don't want to use more than two key fobs in order to start your car. This is a security precaution that is designed to block unauthorized users, like valet drivers who are not authorized to use your key and thereby launching your vehicle.

how to open a mazda cx 5 key fob to Reprogram a spare key

It's smart to know how to reprogram a spare key in the event that your original key becomes lost or stolen. This will stop unauthorised people from getting into your car and causing damage to it. This procedure should work with any mazda keyless entry remote 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 dealership to get it done.

Begin by getting into your driver's seat, and shutting the door, excluding for the one that's already opened. Set the ignition to ON and insert the first functioning key. After five seconds, remove the key and repeat with the second working key.

Once you've finished programming your new key, you'll have three keys that you can use to start your vehicle in the future. Before you store each key, make sure that it's working correctly.

It is advisable to purchase an extra Mazda 3 remote, especially when your car is susceptible to issues. You can purchase one on the internet or in your local auto store. Make sure to review the reviews before buying so that you don't get a key fob which isn't compatible with your vehicle.

How to change the battery on a spare key?

It's a nightmare to discover that your key fob has failed, and you are not able to 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 that is located on the back of the key fob. This will remove the metal auxiliary key and expose an opening on both sides of the case. Put the flathead screwdriver in one of these slots and gently pry apart the two halves of the case. Once the battery is fully exposed, take it out and place it in a safe place somewhere you won't forget it.

Be sure to have an additional battery prior to beginning. They can be found at any retailer that sells batteries or at a mazda replacement keys dealer close to Winter Garden. The correct battery is vital to ensure that your keyfob is working correctly.

Then, place the new battery in its place and then replace the cap on the battery. Be careful not to damage the small rubber ring that the battery is placed on. Press the two halves together until you hear a click.

How to Reset a Keyless Entry System

The Mazda 3 key fob is not just a convenient feature. It's also a security feature. The car will not start if your key is lost or stolen, even if you've got an extra fob. The key fob should be reprogrammed by the dealer to enable it to function again. This can be an expensive and time-consuming process therefore it's a great idea to understand how to reset the system yourself.

To reset the system, disconnect the battery for around 15 minutes. This will eliminate any residual electric current from the onboard computer. The next step is to disconnect the LF-ECU and demand switch connectors. Check continuity between the following terminals.

To program an entirely new key or spare, place it in the slot and set the ignition to ON. Put the key in for about five seconds, then switch it off. The key's details are now added to the computer in your car and the new fob is able to start your vehicle. You can program any number of fobs you need however only one should be in use at any given time. This prevents unauthorized people from copying the key and getting ahold of your vehicle. You can purchase a replacement keyfob on the internet, but it must be programmed and cut by a dealer.