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Mazda 3 Key Fob Replacement There are occasions when an Mazda 3 owner might need to change the battery on their key fob. It is easy to complete this task yourself. To replace the battery, press the small button on the back of the key fob. Press the button, then remove the cover. Lost Keys Losing your car keys was an inconvenience that was minor. It was comparatively inexpensive to replace them at any hardware store, dealer or locksmith. Today, your car's high-tech key fob can do more than simply lock and start your car and that convenience comes with a cost: more expensive replacements. The key fob has a security chip built into it that sends a specific code that is sent to the car's computers to allow you to unlock and begin the engine. The key fob can also control other functions, such as opening your windows in the hottest parking space and summoning the car to you, allowing you to reverse into a tight space (a feature that is available on certain Genesis GV60 sedans and Hyundai Sonata sedans). Mazda's remote controls aren't nearly as expensive as other carmakers'. You can even replace the battery on your key fob yourself, with a bit of know-how. You'll require a flathead screwdriver as well as an updated CR2025 to do this. Use the red and directions buttons to lock or unlock your doors prior to changing the batteries. If you're looking to save money on the cost of a Mazda 3 key fob replacement find one on eBay that is OEM and doesn't require programming by a dealer or locksmith. You can find a wide selection on eBay although they may not have the same design or color as the one you have currently. Lockouts One of the most horrible things that can happen to a driver is being locked out of their vehicle. There are several tricks drivers can use to get inside their vehicle. The first step is calling their local locksmith or Mazda dealership. This is a viable option as it's likely be less expensive and more efficient than calling a tow truck. The locksmith or dealer will require a key code from the database in order to cut you a new key fob which typically costs about $100. It is important to secure this code. If you're stuck outside your car, one of the things people can do is look for an auxiliary button on the bottom. There is typically an oblong, small button that can be pressed and held. This will open the doors to the vehicle and allow the driver to open them by hand. The emergency override function is a different method to gain access to an unlocked vehicle. This allows you to use your key fob to disable any functions that have been disabled by the theft deterrent system. This will activate the hazard lights and sound to prove that the doors, lids for the fuel filler or liftgate are closed. Transponder Chips If your key fob has the chip for transpondering built into the head of the metal L-shaped metal key, you'll need to visit a locksmith or dealer to get it replaced. The chips have an unique identification number that allows your car to start the engine. The antenna ring emits radio frequency energy when you insert your metal key and turn it on. The energy is then absorbed by the chip transponder in the key. The chip responds by sending an encoded message to the antenna ring. This informs the car that the key is legitimate. The majority of Mazdas have a transponder chip with an evolving code that changes each time you turn it. This means that the key you're using won't be compatible with your vehicle until you've got a duplicate with the exact code inside the ignition cylinder. It's not that difficult to create your own replacement keys. If you're able find a working key, place it into your Mazda and turn the ignition to ON. You can copy the information from the key to the other key, if it starts your Mazda. If needed, you may also use the eraser on your key fob to erase the code. G28CarKeys is not guaranteed to be effective since some transponder chips recycled might not function correctly. Programming Losing your car keys is an expensive and time-consuming ordeal. Mazda has made programming and adding a third car key easy. It is possible to do this in a few simple steps, and you will not need to pay the dealer for the service. You can avoid paying for towing charges or dealership fees if you own an additional car key. It is necessary to purchase a new battery for the key fob. One can be purchased at the big box retailer or a hardware store for about $10. You'll also need an open-ended screwdriver that is flat to open the fob. The screwdriver's head should fit inside a tiny slot or a space on the side of the fob. After removing the case replace the old battery. Now you can program your new key fob. To do this, put the working key into the ignition and then turn it ON. For about five seconds, and then switch off the ignition. Repeat the process using a second key that works as well, and then your new (or additional) key. After this is done your newly programmed key should be capable of starting your Mazda. If it's not, it could be a problem with the key fob.