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Mazda 3 Key Fob ReplacementThere are times when an Mazda 3 owner might need to change the battery on their key fob. This is a straightforward task you can perform yourself.To change the battery, find the small button on the back of the key fob. Press the button and remove the cover.Lost KeysBefore the 1990s, losing your car keys was an annoyance that was not a major inconvenience. You could replace them at any hardware store, locksmith, or dealer and it was affordable to do this. Today, your vehicle's high-tech key fob does much more than lock and start your car and that convenience comes with a cost: more expensive replacements.The key fob comes with security chips that transmit an unique code to computer of the car, which allows it to unlock and start it. The key fob can also be used to control other features, like the windows being rolled down in the hottest parking space and requesting the car to come to you, allowing you to reverse out of a tight spot (a feature that is available on certain Genesis GV60 sedans and Hyundai Sonata sedans).Luckily, Mazda's remote fobs aren't as costly as those from other automakers. With a little know-how you can swap out the battery of your key fob yourself. To do this, you'll need an inexpensive flathead screwdriver, an updated CR2025 battery and your key fob. Use the red and directional buttons to lock and unlock your doors prior to changing the batteries.If you're looking to save money on a Mazda 3 key fob replacement search for one on the internet that is OEM and doesn't require programming by a dealer or locksmith. eBay offers a wide selection of options, however, they may not be the same color as your existing key fob.LockoutsA driver being locked out of their car is one of the most traumatic situations that can happen. There are, however, a few tricks that drivers can apply to get back in their car. They should first try calling their local Mazda dealership or locksmith. This is a good option as it is likely to be less expensive than calling a tow truck, and it's faster too. The locksmith or dealer will require a key code from the database 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 additional key that is located on the underside. There is typically small, round button that can be hit and held. This will unlock the doors of the vehicle and allow the driver to open them manually.The emergency override feature is a second method to gain access an unlocked vehicle. This will allow you to use your key fob to bypass any functions that were suspended by the theft deterrent system. It will typically activate the warning lights for hazard and sound signalling that the doors, lids for fuel-filler or liftgate are shut.Transponder ChipsIf the key fob you have has the chip for transpondering built into the head of the L-shaped key, you'll need to visit an authorized locksmith or dealer to get it replaced. These chips are equipped with a unique identification code that allows you to start your car.When you insert your key and turn it to ON the antenna ring transmits a burst of radio frequency energy that is received by the transponder chip inside the metal key. The chip responds with an identifier that is transmitted to the antenna ring, telling the car that it's an authentic key.Most Mazdas are equipped with a transponder chip that is rolling code that alters its code each time you turn the key. This means that the key will not work with your vehicle until you have a copy that has the exact same code in the ignition.It's possible to make your own replacement keys. If you're able find an original key, insert it into your Mazda and turn the ignition to ON. If the key starts your vehicle, you can copy the information to the other key that works. If needed, you may also use the eraser of your key fob to erase the code. This method isn't certain to be successful, as some transponder chips that are recycled might not work properly.ProgrammingLosing your car keys is an expensive and time-consuming ordeal. Fortunately, Mazda has made it easy to add the third key. This can be done in a few simple steps and you won't have to pay an agent for this service. If you have a spare car key, this is the most efficient way to avoid paying for towing and dealer charges.You'll first need to purchase a new battery for the key fob. You can buy one at a big box retailer or hardware store for around $10. You'll also require a flathead screwdriver in order to open the fob. The screwdriver's head should fit into small slots on the side of the fob. After removing the case replace the battery that was in it.Now you can program your new key fob. Insert the first key that operates into the ignition and turn it ON. For about five seconds, and then switch off the ignition. Repeat the process with a second working key, and then your new (or spare) key. Once G28CarKeys have done this and your Mazda should be able to be started using the newly programmed keys. If not then there could be a issue with your key fob or vehicle.