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Mazda 3 Key Fob Replacement Mazda 3 owners may need to replace the battery in their keyfob in time. This is an easy task that you can complete yourself. To change the battery, locate the small button on the back of the key fob. Press the button and remove the cover. Lost Keys Before the 1990s lost car keys was a minor inconvenience. mazda rx8 key fob was relatively inexpensive to replace them in any hardware store, dealer, or locksmith. Your car's modern key fob is able to do more than secure the vehicle and open it. But that added convenience comes with a price – more expensive replacements. The key fob comes with an encryption chip that sends an unique code to computer of the car to unlock and start it. The key fob can also be used to control other features, like rolling down your windows when you are in hot parking areas and requesting that the car come to you so that you can reverse in tight spaces (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 replace 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. Make sure you utilize the directional buttons and red button to unlock and lock the doors before changing the battery. If you're looking to save money on the cost of a 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 plenty of options on eBay although they may not have the same color or logo as the key fob you currently have. Lockouts One of the worst things that can happen to a driver is being locked out of their car. There are several tricks drivers can use to gain access into their vehicle. First, they should consider calling their local locksmith or Mazda dealership. This is a good option, as it will likely be less expensive and faster than calling a truck. Locksmiths or dealers must purchase a key code from the database to create a new fob. It's about $100. It's important to keep the code secure. Another thing people can do if they are stuck outside of their vehicle is to check the underneath of the key fob to find an auxiliary button. There is usually a small, round button that can be press and held. This will unlock the doors of the vehicle and allow the owner to open them by hand. Another method to gain entry into an unlocked vehicle is using the emergency override feature. This allows you to use the key fob override any functions that have been disabled by the theft deterrent system. This will activate the hazards lights and sound to verify that the doors, lids for the fuel filler or liftgate are closed. Transponder Chips You'll need to replace it if your key fob is equipped with a transponder that is built into the head of the L-shaped key. These chips contain an unique identification number which is used to open your car. The antenna ring emits radio frequency energy when you insert your key made of metal and turn it on. The energy reaches the chip transponder in the key. The chip responds by sending a code that's transmitted to the antenna ring, telling the car that it's a valid key. The majority of Mazdas have a transponder chip with a rolling code that changes every time you turn it. This means that the key will not work with your vehicle until you have a second copy with the exact same code in the ignition. It's not difficult to create your own replacement key. If you're able to locate a working key, place it inside your Mazda and turn the ignition to ON. You can copy the information from the key to the second key if it starts your Mazda. If you need to, you can also utilize the eraser on your key fob in order to erase the code. It's important to keep in mind that this method isn't guarantee that it will work, as some transponder chips recycled from the past might not work correctly. Programming The loss of your car keys can be an expensive and time-consuming experience. Mazda has made adding and programming the third car key simple. You can do this with only a few steps and you won't have to pay the dealer for the service. You will not have to pay for a tow or dealership fees if you have an additional car key. You'll need to buy an extra battery for your key fob. You can buy one at a big box store or hardware store for around $10. You'll also need an open-ended screwdriver that is flat to open the fob. The screwdriver's tip should fit in a small slot or a space on the side of the fob. After you've removed your case and battery, you'll need to replace the old battery with the new one. Now you can program your new key fob. Insert the first key that is working into the ignition and turn it ON. It should take about five seconds and then turn the ignition off. Repeat the process using another key that works as well, and then the new (or additional) key. After you've completed this and the key that you have programmed should be capable of starting your Mazda. If not, it may be a problem with the key fob.