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Mazda 3 Key Fob Replacement There are times when a Mazda 3 owner might need to change the battery in their key fob. This is a simple job that you can do yourself. Find the small button at the back of your key fob. Press it and then remove the cover. Lost Keys Losing your car keys was an inconvenience of a minor nature. It was relatively inexpensive to replace them in any hardware store, dealer, or locksmith. Your car's top-of-the-line key fob can do much more than just secure the vehicle and open it. But that convenience comes at costs – more expensive replacements. The key fob comes with a security chip embedded in it that sends a unique code to the car's computer in order to allow you to unlock and begin the engine. The key fob can also be used to control other features, like the windows being rolled down in the hottest parking space and summoning the car to you in order to reverse out of a tight spot (a feature that is available on certain Genesis GV60 sedans and Hyundai Sonata sedans). Mazda's remote controls aren't as expensive as other carmakers'. With a little knowledge you can change the battery on your key fob by yourself. To do this, you'll need the smallest flathead screwdriver a brand new CR2025 battery, and your key fob. Make sure you use the directional buttons as well as the red button to lock and unlock the doors prior to changing the battery. If you're looking to cut costs you can find a Mazda 3 keyfob online that is OEM. It doesn't need programming by a locksmith or dealer. You'll find plenty of options on eBay however they may not have the exact colour or logo as the one you have currently. Lockouts A driver being locked out of their car is one of the most traumatic scenarios that could happen. There are some tricks drivers can employ to get inside their vehicle. First, they should call their local Mazda dealership or locksmith. This is a great option because it's less expensive than calling a tow truck, and it's faster too. A dealer or locksmith must purchase a key code from the database in order to make a new fob. It's about $100. This is why it's important to keep this key code in a safe location. If you are stuck outside your vehicle, another thing to do is search for an additional key on the underside. There is usually small, round button that can be pressed and held. This will unlock the doors of the vehicle and allow the owner to open them by hand. Another way to gain entry into a locked vehicle is by using the emergency override feature. This will allow the key fob to take over the functions suspended by the theft-deterrent system. This usually triggers the warning lights for hazard and sound to confirm that the doors, lids for fuel-filler or liftgate have been shut. Transponder Chips If your key fob is equipped with a transponder chip built into the head of the L-shaped key, you'll need to go to a locksmith or dealer in order to get it replaced. These chips contain an unique identification number that can be used to start your vehicle. When you insert your key and turn it to the ON position the antenna ring releases an explosion of radio frequency energy that gets to the transponder chip that's in the key's metal. The chip responds by sending a code to the antenna ring. This informs the car that the key is in good condition. The majority of Mazdas have transponder chips that have a code that is changing every time you turn it. This means that the key you're using isn't going to work on your vehicle until you have a duplicate that has the exact same code in the ignition cylinder. It's not difficult to create your own replacement key. If you find a key that works then insert it into your Mazda. Turn the ignition ON. You can copy the information from the key to the other key in case it starts your Mazda. You can also try the eraser function on your key fob to erase the current code, if necessary. This method is not guarantee that it will work as transponder chips that are recycled might not function correctly. Programming The loss of your car keys can be an expensive and time-consuming experience. Fortunately, Mazda has made it simple to add and program an additional key. This can be done in a couple of steps and you won't need to pay a dealer for this service. If you have an extra car key, this is the most efficient way to avoid paying for towing charges and dealer costs. It is necessary to purchase new batteries for the key fob. You can buy one at an hardware store or a big box retailer for around $10. mazda 3 car key replacement 'll also require a flathead screwdriver to open the fob. The screwdriver's tip should fit into an opening 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 first key that operates into the ignition and turn it ON. Then, wait for five seconds and then turn the ignition off. Repeat the process using a second working key, and then your new (or spare) key. After this is done your newly programmed key should be able to start your Mazda. If not, it could be a problem the key fob.