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Mazda 3 Key Fob Replacement Mazda 3 owners may need to replace the battery in their keyfob every now and then. You can do this task yourself. Find the small button on the back of your key fob. Press the button to remove the cover. Lost Keys Prior to the 1990s the 1990s, losing your 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 affordable to do so. replace mazda key is able to do more than just lock and unlock the car. But that convenience comes at the cost of replacements. The key fob has an encryption chip that sends an unique code to the computer of the car to allow it to be unlocked and start it. The key fob can also control other functions, such as opening your windows in hot parking spaces and requesting the car to come to you, allowing you to reverse out of a tight spot (a feature available on some Genesis GV60 sedans and Hyundai Sonata sedans). Luckily, Mazda's remote fobs aren't as expensive from other automakers. You can even replace the battery of your key fob yourself with a little bit of know-how. You'll need a flathead screwdriver and a new CR2025 to complete this. Make sure to use the directional buttons and red button to unlock and lock the doors prior to changing the battery. If you're looking to save money, find a Mazda 3 keyfob online that is OEM. It doesn't need programming by an authorized locksmith or dealer. You can find a wide selection on eBay however they may not have the same color or logo as the one you have currently. Lockouts One of the most horrible things that can happen to a driver is becoming locked out of their vehicle. There are some tricks that drivers can use to gain access into their car. The first step is calling the local locksmith or Mazda dealership. This is a good idea because it will probably be less expensive than calling for a tow truck and will be quicker as well. Locksmiths or dealers must purchase a key code in the database in order to make you a new fob. It will cost around $100. This is why it's crucial to keep this code in a safe place. The other thing that people can do when stuck outside of their vehicle is to check the underside of the key fob to find an additional button. There is typically a small, round button that can be pressed and held. This will unlock the doors of the vehicle, allowing the driver to open them by hand. Another way to enter the vehicle locked is by using the emergency override feature. This allows the key fob to bypass the functions suspended by the theft-deterrent system. This usually triggers the hazards warning lights and make a signalling that the doors, lids for fuel-filler, or liftgate are closed. Transponder Chips If your key fob has the chip for transpondering built into the head of the L-shaped key, then you'll need to go to an authorized locksmith or dealer to get it replaced. These chips contain an unique identification number that allows you to start your vehicle. When you insert your key and turn it to ON, the antenna ring sends out an impulsive radio frequency energy that gets to the transponder chip that's in the metal key. The chip responds by sending a code to the antenna ring. This informs the car that the key is legitimate. Most Mazdas utilize 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 second copy with the exact same code in the ignition. It's not too difficult to create your own replacement key. If you can locate a key that works then insert it into your Mazda. Then turn the ignition ON. If the key is able to start your vehicle, you can copy the data from it onto the other working key. If you need to, you can also use the eraser on your key fob in order to erase the code. This method isn't certain to be successful because some transponder chips recycled may not work correctly. Programming The loss of your car keys is costly and time-consuming. Fortunately, Mazda has made it easy to add an additional key. You can do this in only a few steps and you won't have to pay the dealer for the service. If you have a spare car key this is the ideal way to avoid paying for a tow and dealership charges. The first step is to buy a new battery for the fob. It can be found at the big box retailer or hardware store for around $10. To open the fob, you'll need a flathead screwscrew. The screwdriver's head must fit in a small slot or space on the side of the fob. After you've removed your case you'll have to replace the battery that was in the case with a new one. Now you can program your new key fob. To do this, put the first working key into the ignition and then turn it ON. Wait for about five seconds and then turn the ignition off. Repeat the process with another key that is working before switching to your new (or extra) key. Once you've done this the new key should be capable of starting your Mazda. If it's not, there might be a problem with the key fob.