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Mazda 3 Key Fob Replacement There are occasions when an Mazda 3 owner might need to change the battery in their key fob. It is easy to complete this task yourself. Find the small button on the back of your key fob. Press the button and then remove the cover. Lost Keys Losing your car keys used to be an inconvenience of a minor nature. You could replace keys at any hardware store, locksmith store, or dealer, and it was fairly cheap to do so. Your car's modern key fob can do more than lock and start your car. However, that added convenience comes with costs – more expensive replacements. The key fob contains a security chip that transmits an unique code to the computer of the car to allow it to be unlocked and begin the. The key fob can also control other functions, such as rolling down your windows in hot parking areas and requesting the car to come to you in order to reverse out of a tight spot (a feature available on some Genesis GV60 sedans and Hyundai Sonata sedans). Fortunately, Mazda's remote fobs aren't as costly as those from other automakers. If you have the right knowledge you can change the battery of your key fob yourself. You'll need a flathead screwdriver and a brand new CR2025 to do this. Make sure you use the directional buttons as well as the red button to unlock and lock the doors before changing the battery. If you're looking to cut costs and save money, look for a Mazda 3 keyfob online that is OEM. It doesn't require programming by an authorized locksmith or dealer. You can find a wide selection on eBay, though they may not have the same design or color that your current key fob. Lockouts One of the most horrible things that can happen to a driver is becoming locked out of their car. Luckily, there are a few tricks that drivers can use to gain access back into their car. First, they should try calling the local locksmith or Mazda dealership. This is a good idea as it's likely be less expensive and quicker than calling a truck. Locksmiths or dealers must purchase a key code from the database in order to make you a new fob. The cost is around $100. It is essential to keep the code secure. The other thing that people could do if stuck outside of their vehicle is to look at the underside of the key fob to locate an additional button. There is typically an oblong, small button that can be placed and held. This will unlock the doors of the vehicle and permit the owner to open them manually. Another way to get into a vehicle that is locked is using the emergency override feature. This will allow the key fob to take over the functions suspended by the theft-deterrent system. This is usually the case. hazards warning lights and make a sound for confirmation that the doors, fuel-filler lid or liftgate are shut. Transponder Chips You'll have to replace it if your key fob has a transponder embedded in the metal head of the L-shaped key. These chips contain an identification code which is used to open your car. The antenna ring releases a burst of radio frequency energy when you insert your metal key and switch it on. The energy reaches the chip's transponder located in the key. The chip responds with a code that's sent to the antenna ring telling the car that it's an authentic key. Most Mazdas have transponder chips that have a rolling code that changes every time you turn it. G28 Car Keys means that the key will not work with your vehicle until you have a copy with the exact code in the ignition. It's not difficult to make your own replacement keys. If you're able to find a working key, place it inside your Mazda and set the ignition to ON. If the key is able to start your vehicle, you'll be able to copy the information to the other key that works. If you need to, you can also use the eraser on the key fob to erase the code. It is important to remember that this method isn't 100% guaranteed to work, since certain transponder chips that have been recycled may not respond correctly. Programming The loss of your car keys is a costly and time-consuming experience. Luckily, Mazda has made it simple to add and program the third key. This can be accomplished in a few simple steps and you won't need to pay an agent for this service. If you have a spare car key this is the best method to avoid paying for a tow and dealership fees. In the beginning, you'll need find a replacement battery to the fob. One can be purchased at an online retailer or at a hardware store for approximately $10. You'll also require an open-ended screwdriver that is flat to open the fob. The screwdriver's head should fit into a small slot or space on the side of the fob. After taking the case off, replace the battery that was in it. Now is the time to program the new key fob into your vehicle. Insert the first key that works into the ignition and turn it ON. It should be on for about five seconds and then switch it off. Repeat the process using a second key that works as well, and then your new (or extra) key. After you've completed this, your Mazda should have the ability to be started using the newly programmed keys. If not it could be due to a problem with the key fob, or the vehicle.