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Mazda 3 Key Fob Replacement There are times when an Mazda 3 owner might need to change the battery in their key fob. This is an easy task that you can accomplish yourself. Find the small button located at the back of your key fob. Press it, then take off the cover. Lost Keys The loss of your car keys was an inconvenience of a minor nature. It was comparatively inexpensive to replace them at any hardware store, dealer, or locksmith. Your car's high tech key fob is able to do more than simply lock and start the vehicle. But that convenience comes at the cost of replacements. The key fob is equipped with an embedded security chip in it that sends a specific code to the car's computer to enable you to open and start the engine. The key fob can also control other functions, such as rolling down your windows when you are in a hot parking area and requesting that the car come to you so you can reverse out of a tight spot (a feature available on some Genesis GV60 sedans and Hyundai Sonata sedans). Fortunately, Mazda's remotes aren't nearly as expensive as those from other automakers. You can even change the battery in your key fob yourself with a little bit of know-how. You'll require a flathead screwdriver as well as a brand new CR2025 to complete this. Use the red and directional buttons to lock and unlock your doors before changing the batteries. If you're looking for a way to save money look for a Mazda 3 keyfob online that is OEM. It doesn't need programming by an authorized locksmith or dealer. You'll find many options on eBay, though they may not be the same design or color as the key fob you currently have. Lockouts One of the most horrible things that can happen to a driver is being locked out of their car. There are some tricks that drivers can use to gain access into their car. You should first contact their local Mazda dealership or locksmith. This is a good idea because it will probably be cheaper than calling a truck and will be faster too. The dealer or locksmith will need to buy a key code from the database to create a new key fob, which typically costs around $100. It's important to ensure the security of this code. If you're stuck in the car, the other thing to do is search for an additional key located under the car's underside. The button is usually small and round that can be pressed. This will unlock the doors of the vehicle and permit the owner to open them by hand. Another method to gain entry into a locked vehicle is by using the emergency override feature. This allows you to use your key fob to bypass any functions that are suspended by the theft deterrent system. This will activate the alarm lights and sound to ensure that the doors, lids of the fuel filler or liftgate are shut. Transponder Chips You'll need to replace it if your key fob is equipped with a transponder that is built into the metal head of the L-shaped key. These chips come with a unique identification code which is used to open your car. When G28 Car Keys insert your key and then turn it to the ON position the antenna ring sends out an impulsive radio frequency energy that is received by the transponder chip inside the metal key. The chip then responds with a code that's sent to the antenna ring telling the car that it's an authentic key. Most Mazdas come with transponder chips equipped with a code that is changing each time you turn it. This means that the key you're using will never work on your vehicle until you have a second copy using the same code in the ignition cylinder. Fortunately, it's not impossible to create your own replacement keys. If you can locate a key that works, insert it into your Mazda. Then turn the ignition on. You can copy the information from the key to the other key, if it starts your Mazda. You can also use the eraser procedure on your key fob in order to erase the current code, if required. This method is not guaranteed to be effective, as some transponder chips that are recycled might not work properly. Programming Losing your car keys is an expensive and time-consuming ordeal. Mazda has made adding and programming the third car key simple. This can be accomplished in a few simple steps, and you won't need to pay a dealer for this service. You will not have to pay for towing or dealer charges if you have an extra car key. In the beginning, you'll need purchase a replacement battery for the fob. It can be found at a big box retailer or at a hardware store for approximately $10. You'll also need an open-ended screwdriver that is flat to open the fob. The screwdriver's head must fit into a small slot or space on the side of the fob. After removing the case replace the battery that was in it. Now it's time to set up the new key fob in your vehicle. To do this, put the working key into the ignition and turn it to ON. Wait about five seconds, and then turn it off. Repeat the process with a second key that works, and then the new (or additional) key. After this is done, the newly programmed key should be in a position to start your Mazda. If it's not, it could be a problem with the key fob.