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Mazda 3 Key Fob ReplacementMazda 3 owners may need to replace the battery on their keyfob at times. This is a simple task that you can complete yourself.To change the battery, look for the small button located on the back of the key fob. Press the button and then remove the cover.Lost KeysPrior to the 1990s lost car keys was an annoyance that was not a major inconvenience. You could replace them at any hardware store, locksmith shop, or dealer, and it was fairly inexpensive to do it. Today, your car's high-tech key fob can do more than just unlock and unlock your car and that convenience comes with a cost: more expensive replacements.The key fob comes with a security chip built into it that transmits a unique code to the car's computer to allow you to unlock and start the engine. The key fob is also capable of controlling other functions, such as opening the windows when you're in a hot parking area and summoning your car for easier reverse maneuvers into an awkward spot (a feature available on some Genesis GV60 and Hyundai Sonata sedans).Mazda's remote controls aren't as expensive as other carmakers'. With a little knowledge you can swap out the battery of your key fob yourself. You'll require a flathead screwdriver as well as the new CR2025 for this. Use the red and directions buttons to lock or unlock your doors before changing the batteries.If you're looking to save money look for an Mazda 3 keyfob online that is OEM. It doesn't require programming by a locksmith or dealer. You'll find plenty of options on eBay although they may not have the exact color or logo as the key fob you currently have.LockoutsA driver being locked out of their vehicle is one of the worst things to occur. Thankfully, there are a few strategies that drivers can utilize to get back into their car. The first step is calling their local locksmith or Mazda dealership. This is a viable option because it's likely to be cheaper and faster than calling a tow-truck. Locksmiths or dealers must buy a keycode from the database in order to make a new fob. This will cost approximately $100. G28 is essential to secure this code.The other thing that people can do when stuck outside their car is to look on the underside of the key fob for an auxiliary button. There is usually small, round button that can be pressed and held. This will open the doors of the vehicle, allowing the driver to open them manually.The emergency override function is another method to gain access to an automobile that is locked. This allows the key fob to take over the functions that are suspended by the theft-deterrent system. This will activate the hazard lights and sound to ensure that the doors, the lid for the fuel filler, or liftgate is closed.Transponder ChipsIf your key fob is equipped with a transponder chip embedded in the head of the metal L-shaped metal key, you'll need to visit an authorized locksmith or dealer to replace it. These chips are equipped with an unique identification number that is used to start your car.The antenna ring emits a burst radio frequency energy when you insert your metal key and turn it on. This energy reaches the chip transponder inside the key. The chip responds by sending an encryption code to the ring. This informs the car that the key is valid.Most Mazdas come with transponder chips with a code that is changing every time you turn it. This means that the key will not work on your vehicle until you have a copy with the exact same code in the ignition.It's not too difficult to create your own replacement key. If you're able to find an actual key, you can insert it into your Mazda and turn the ignition to ON. You can copy the data from the key to the second key if it starts your Mazda. If you need to, you can also use the eraser on your key fob to remove the code. This method isn't certain to be successful because some transponder chips recycled might not function correctly.ProgrammingLosing your car key can be expensive and time-consuming. Fortunately, Mazda has made it easy to add and program the third key. This can be accomplished in just a few steps and you won't have to pay an agent for this service. If you have a spare car key, this is the best way to avoid having to pay for towing and dealer costs.You'll need to buy an extra battery for your key fob. One can be purchased at an online retailer or a hardware store for about $10. You'll also require a flathead screwdriver to open the fob. The screwdriver's head should fit into small slots on the back of the fob. After taking the case off, replace the old battery.Now you can program your new key fob. Insert the initial key that works into the ignition and turn it ON. Wait for about five seconds and then turn the ignition off. Repeat the process using a second working key, and then with your new (or spare) key. After you've done this and your Mazda should be able to be started with the newly programmed keys. If it's not then there could be a problem with your key fob or vehicle.