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Mazda 3 Key Fob Replacement Mazda 3 owners may need to replace the battery on their keyfob at times. It is easy to complete this task yourself. To change the battery, look for the small button located on the back of the key fob. Press it, then take off the cover. Lost Keys Prior to the 1990s losing your car keys was a minor inconvenience. It was relatively inexpensive to replace them at any hardware store, dealer or locksmith. Your car's modern key fob does more than simply secure the vehicle and open it. However, that added convenience comes with a price – more expensive replacements. The key fob features a security chip embedded in it that sends a specific code that is sent to the car's computers to enable you to open and start the engine. The key fob is capable of controlling some other features, such as opening the windows when you're in a hot parking spot and summoning your car to you to make it easier to reverse into an area that is tight (a feature offered on some Genesis GV60 and Hyundai Sonata sedans). Mazda's remote controls don't cost nearly the price of other car makers'. G28CarKeys can even replace the battery on your key fob yourself, with a amount of knowledge. To do this, you'll need a small flathead screwdriver, a brand new CR2025 battery, and your key fob. Use the red and directional buttons to lock and unlock your doors prior to changing the batteries. If you're looking to save money on an Mazda 3 key fob replacement you can find one online that is OEM and does not require programming by a locksmith or dealer. You'll find many options on eBay although they may not have the same design or color as your current key fob. Lockouts A driver being locked out of their vehicle is among the most unpleasant situations that can happen. Thankfully, there are a few tricks that drivers can use to get back into their vehicle. First, they should consider calling their local locksmith or Mazda dealership. This is a good option for a variety of reasons, and it's likely to be less expensive and quicker than calling a tow-truck. The locksmith or dealer will need to buy a key code from the database in order to cut you a new key fob, which usually costs about $100. It is crucial to secure this code. If you're stuck outside your vehicle, another thing you can do is search for an additional key on the underside. There is usually an oblong, small button that can be pressed and held. This will open the doors of the vehicle and allow the owner to open them by hand. Another way to get into a locked vehicle is by using the emergency override feature. This allows you to use the key fob to override functions that have been disabled by the theft deterrent system. This will activate the hazard lights and sound to confirm that the doors, lids of the fuel filler or liftgate have been shut. Transponder Chips If the key fob you have has an embedded transponder chip in the head of the metal L-shaped key, you'll have to visit a locksmith or a dealer to replace it. These chips have a unique identification number that allows your vehicle to start the engine. The antenna ring emits radio frequency energy when you insert your key in the metal and switch it on. This energy reaches the chip transponder within the key. The chip responds by sending an encryption code to the ring. This tells the car that the key is legitimate. Most Mazdas use an electronic transponder chip that alters its code each time you turn the key. This means that your key will not function with your vehicle until you have a second copy with the exact code in the ignition. It's not too difficult to create your own replacement key. If you can locate an original key, insert it inside your Mazda and turn the ignition to ON. You can copy the data from the key to the second key, if it starts your Mazda. You could also try the eraser process on your key fob in order to erase the current code, if necessary. It's important to note that this method is not guarantee that it will work, as certain transponder chips that have been recycled might not be able to respond properly. Programming The loss of your car keys is an expensive and time-consuming process. Fortunately, Mazda has made it easy to add 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 keys, this is the ideal way to avoid having to pay for towing or dealership fees. You'll first need to purchase a new battery for the key fob. One can be purchased at an online retailer or a hardware store for about $10. To open the fob, you'll require an screwdriver with a flat head. The screwdriver head should fit into a small slot on the back of your fob. After taking the case off, replace the old battery. It's time to add the new key fob for your vehicle. To do this, simply insert the working key into the ignition, and turn it on. It should be on for about five seconds and then switch off the ignition. Repeat the process with a second working key, then your new (or spare) key. Once you've done this the new key should be able to start your Mazda. If not, it could be a problem with the key fob.