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

It's a good idea always to have a spare key on hand, whether you dropped the keyfob you were using or it stopped working. This article will show you how to add, alter or reprogramme the Mazda 3 keyfobs.

Certain keys require programming by an experienced locksmith, whereas others don't. Be sure to only make use of official Mazda replacements for your key fob.

How do I add an extra key

If you're unable to get a spare key from the dealership when you buy your Mazda 3 or accidentally break your current one but don't worry, there is still a way to add another key. To accomplish this, you'll require an incredibly small screwdriver, a flathead screwdriver, and the new CR2025 batteries. Once you've got the tools, it is time to open the key fob. First, locate the key release button for the auxiliary key. The button is beneath the metal portion. It's easy to find. The back cover should come off as soon as you press the button. Next, insert the head of the screwdriver into the notch or the space on the top of the metal component and pry it off.

After the auxiliary key has been removed, insert the new or spare key into the slot. Set the ignition ON and then wait for around five seconds, then set it to off. This will allow the system to recognize the new key and begin your vehicle in the future.

It is important to remember that you can only program up to three keys on your Mazda 3. You don't want to have to utilize more than two keys to start your car. This is a safety measure designed to prevent unauthorized users, like valet drivers, from activating your key and thereby starting your car.

How to reprogram an unrepaired key?

It's a smart idea to learn how you can reprogram an extra key in the event that the original key is lost or stolen. This will keep unauthorized people from taking your car and then starting it. This process is compatible with any mazda 2 spare key however, you'll require two keys that work to begin the reprogramming process. If you don't have two working keys it's recommended to take your vehicle to a dealer to get this done.

Begin by stepping into your driver's seat, and shutting the door, excluding for the one that's open. Set the ignition to ON and insert the first functioning key. Then wait five seconds before taking out the key. Repeat with the second key.

Once you've completed programming your new key you should have three keys that be able to start your car in the future. Before storing each key, make sure that it's functioning properly.

It is advisable to purchase a spare Mazda 3 remote, especially in cases where your car is prone to problems. You can purchase one online or in your local auto store. Make sure to look up reviews before you purchase to ensure that you don't purchase the wrong key fob that isn't compatible with your vehicle.

How do I change the battery on a spare key?

It's depressing to find out that the key fob you used to use has gone out, and you are in a position to not unlock your car. It's easy to change the battery yourself and save money at the dealer.

The first step is to press the auxiliary key button on the back of the key fob. This will release the metal key and reveal an opening on each side of the case. Put the flathead into one of these slots and gently pry the two halves apart. When the battery is fully exposed, take it out of the case and place it somewhere that you will not forget it.

Be sure to bring a new battery ready prior to starting. They can be found at any retailer that sells batteries or at an Mazda dealer close to Winter Garden. The correct type of battery is crucial to ensure that your key fob functions properly.

Replace the battery cap and then insert the new battery. Be careful not damage the rubber ring that holds the battery. Press the two halves together until you can hear the click.

How do you reset the Keyless Entry System

The Mazda 3 key fob is not just a practical feature. It also serves as an element of security. If you lose your key or had it stolen, the car will not start even if you have the spare fob. This is because the fob that you have to be reprogrammed by the dealership in order to function properly. This can be a painful and repaired expensive ordeal. Therefore, it's recommended to know how to reset the system.

To reset the system, disconnect the battery for approximately 15 minutes. This will remove any residual electricity from the onboard computer. Then, disconnect both the LF-ECU and demand switch connectors. Verify the continuity between the next terminals.

Place the key into the slot, and turn the ignition ON. Keep the key in place for about five seconds, then turn off. The information from the key will be transferred to your vehicle's computer and the new fob will be able start your vehicle in the future. You can program as many fobs as want, but only one should be used at any certain time. This prevents unauthorized people from copying the key and getting ahold of your car. You can buy a new keyfob online, however it'll still need to be cut and programmed by a dealer.