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Mazda 3 Key Fob Replacement There are instances when an Mazda 3 owner might need to change the battery in their key fob. You can do this task yourself. Find the small button at the back of your key fob. Press mazda 3 key and remove the cover. Lost Keys Before the 1990s the 1990s, losing your car keys was an annoyance that was not a major inconvenience. It was relatively inexpensive to replace them in any hardware store, dealer, or locksmith. Your car's high tech key fob does more than just lock and unlock the car. However, that convenience comes at costs – more expensive replacements. The key fob has an electronic security chip that sends an individual code to the computer in the car that allows it to unlock and start it. The key fob is also capable of controlling other functions, such as opening and closing the windows when you're in a hot parking spot and summoning your car to you for easier reverse maneuvers into the tight spots (a feature offered on some Genesis GV60 and Hyundai Sonata sedans). Fortunately, Mazda's remotes aren't as expensive from other automakers. With a little bit of knowledge you can swap out the key fob's battery yourself. To accomplish this, you'll require a small screwdriver with a flat head, a brand new CR2025 battery, and your key fob. Use the red and the directional buttons to lock and unlock your doors prior to changing the batteries. If you want to save money on the cost of a Mazda 3 key fob replacement you can find one online that is OEM and doesn't require programming by a dealer or locksmith. eBay has many options, however, they might not be the exact color of your current key fob. 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 get inside their vehicle. It is best to first call their local Mazda dealership or locksmith. This is a good idea, as it will likely be less expensive and faster than calling a tow-truck. The locksmith or dealer will require a key code from the database to cut you a new key fob which typically costs around $100. It is essential to keep this code safe. Another thing that drivers can do when they are stuck outside their car is to examine the underneath of the key fob in search of an auxiliary button. The button is usually a small round one that can be hit. This will open the doors of the vehicle and permit the owner to open them manually. Another way to enter an unlocked vehicle is using the emergency override feature. This allows the key fob's device to bypass functions that are not controlled by the theft-deterrent system. This will usually activate the hazards warning lights and make a sounds to confirm that the doors, lids for fuel-filler or liftgate are shut. Transponder Chips If your key fob has a transponder chip embedded in the head of the metal L-shaped key, then you'll need to visit a locksmith or dealer in order to have it replaced. These chips come with a unique identification number that enables your car's engine to start the engine. When you insert your key and then turn it to ON the antenna ring transmits an impulsive radio frequency energy that is received by the transponder chip inside the metal key. The chip responds by sending an encrypted message to the antenna ring. This tells the car that the key is in good condition. The majority of Mazdas have an electronic transponder chip which changes its code each time you turn the key. This means that the key will not function 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 can locate an original key that works and fits into your Mazda. Turn the ignition ON. If the key starts your vehicle, you can copy the information from it to the other working key. If necessary, you can also use the eraser on your key fob in order to erase the code. This method is not 100% guaranteed to work, as some transponder chips that are recycled might not work properly. Programming Losing your car key can be expensive and time-consuming. Luckily, Mazda has made it easy to program and add an additional key. You can do this in a few simple steps, and you don't need to pay the dealer for the service. You can avoid paying for a tow or dealership charges if you have an additional car key. First, you'll need to find a replacement battery to the fob. You can purchase one from an hardware store or a big box retailer for about $10. You'll also require an open-ended screwdriver that is flat to open the fob. The screwdriver head should fit into small slots on the back of the fob. After removing the case replace the old battery. Now you can program your new key fob. To do this, insert the first working key into the ignition, and turn it on. Wait about five seconds, then switch off the ignition. Repeat the process using a second working key, and then your new (or spare) key. After you've completed this, the newly programmed key should be in a position to start your Mazda. If it doesn't, there may be another problem with your key fob or vehicle.