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 best to have an extra key available. This article will tell you how to add, change or reprogramme the Mazda 3 keyfobs.

A word of warning Certain keys need to be programmed by a professional locksmith or dealer, whereas others don't. Make sure to use official Mazda replacements for your key fob.

How do I add an additional key

You can also add an additional key if you don't have a spare key available or when you accidentally damage the one you already have. You'll need a flathead screwdriver and a CR2025 new battery. Once you've got these items and tools, you're ready to open the key fob. Locate the auxiliary key release. It's located on the underside the metal part. It's easy to locate. The back cover should come off when you press the button. Then, you can insert the head of the screwdriver into the notch or the space at the top of the metal part and pry it off.

Insert your spare key or a new one into the slot after taking out the auxiliary key. Switch the ignition on and wait for five seconds, then set it to off. This will register the new key's information to the system, allowing it to start your vehicle in the future.

You can only program three keys to your Mazda 3. The final thing you want is to have more than two functioning key fobs, and not be in a position to get your vehicle started. This is a security precaution that is designed to block unauthorized users, like valet drivers, from activating your key and starting your car.

How to Reprogram a Spare Key

It's a smart idea know how you can reprogram a spare key in the event that your original key is lost or stolen. This will prevent unauthorized people from starting your vehicle or taking it. This method should work on any mazda car key replacement however you'll need two keys working to begin the reprogramming. If you don't have two working keys, you'll need to take your vehicle to a dealer to get it done.

Begin by stepping into the driver's seat, shutting all doors, with the exception of the one that is open. Put the first working key in the slot, and then set the ignition to ON. Then wait five seconds before taking out the key. Repeat with the second key.

Once you've programmed your new key, you'll have three working 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 a spare Mazda 3 remote, especially when your car is susceptible to problems. You can purchase one on the internet or in your local auto store. Make sure to go through reviews prior to purchasing so that you don't get the wrong key fob that isn't compatible with your vehicle.

How to change the battery on a spare key?

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

The first step is to press the auxiliary key button located on the back of the key fob. This will release the metal key auxiliary to reveal slots on both sides of the case. Place the flathead in one of these slots, and then gently pull the two halves of the case apart. Once the battery is fully exposed, take it out of the case and place it in a place where you won't forget it.

Before you start, make sure that you have a new replacement battery. They can be found in any store that sells batteries or at an Mazda dealer near Winter Garden. The right kind of battery is essential to ensure that your keyfob works correctly.

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

How do I reset the system's Keyless Entry System

The key fob in your Mazda 3 is not only a convenience, it's also an important security feature. If you lost your key or had it stolen the car won't start even if you've got the spare key fob. This is because the fob that you have to be reprogrammed by the dealership to work properly. It's a difficult and expensive ordeal. Therefore, it's best to know how to reset the system.

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

Place the key into the slot, and switch on the ignition. Stop the ignition after approximately five seconds. The key information will now be added 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 you desire but only one can be in use at any certain time. This prevents unauthorized people from copying your key and gaining access to your vehicle. You can purchase a new key fob online, however you'll still have to visit an expert locksmith or dealer to have it cut and programmed.