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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. This is a straightforward task that you can accomplish yourself. Find the small button at the back of your key fob. Press the button to remove the cover. Lost Keys Before the 1990s losing your car keys was an annoyance that was not a major inconvenience. It was relatively cheap to replace them at any hardware store, dealer, or locksmith. Today, your vehicle's high-tech key fob does more than lock and start your car and that convenience comes with a cost that is more expensive replacements. The key fob is equipped with an encryption chip that sends an unique code to computer of the car to allow it to be unlocked and start it. The key fob can also control other features such as rolling down your windows when you are in hot parking areas and requesting that the car come to you in order to reverse into a tight space (a feature that is available on certain Genesis GV60 sedans and Hyundai Sonata sedans). Fortunately, Mazda's remotes aren't as expensive as those from other automakers. You can even replace the key fob battery yourself, with a knowledge. To do this, you'll need a small flathead screwdriver, a brand new CR2025 battery and your key fob. Use the red and direction buttons to lock and unlock your doors before changing the batteries. If you're looking to save money on a Mazda 3 key fob replacement you can find one online that is OEM and doesn't require programming by a locksmith or dealer. You'll find plenty of options on eBay however they may not have the same colour or logo that your current key fob. Lockouts One of the worst 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 get back into their vehicle. First, they should try calling the local locksmith or Mazda dealership. This is a viable option, as it will likely be cheaper and faster than calling a tow truck. The locksmith or dealer will require a key code from the database to create an additional key fob, which is usually about $100. It is important to secure this code. The other thing that people can do when they are stuck outside of their car is to check the underneath of the key fob for an auxiliary button. There is typically an oblong, small button that can be pressed and held. This will open the doors of the vehicle and allow the driver to open them manually. Another method to gain entry into a vehicle that is locked is using the emergency override feature. This allows you to use the key fob to bypass any functions that have been suspended by the theft deterrent system. It will typically activate the hazards warning lights and make a sound for confirmation that the doors, fuel-filler lid or liftgate have been shut. Transponder Chips If your key fob contains a transponder chip embedded in the head of the L-shaped metal key, you'll need to visit an authorized locksmith or dealer to get it replaced. The chips are unique in identification number that enables your vehicle to start the engine. When you insert your key and then turn it to the ON position the antenna ring sends out the radio frequency energy that reaches the transponder chip in the metal key. The chip responds by sending an encryption code to the ring. This informs the car that the key is in good condition. Most Mazdas come with transponder chips with a changing code that changes each time you turn it. 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 possible to make your own replacement keys. If you can locate an original key, insert it inside your Mazda and turn the ignition to ON. You can copy the information from the key to the second key if it is able to start your Mazda. If needed, you may also use the eraser of the key fob to remove the code. It's important to note that this method isn't guarantee that it will work, as some transponder chips from recycled systems may not respond correctly. Programming The loss of your car keys is expensive and time-consuming. Fortunately, Mazda has made it easy to add and program a third key. mazda replacement key 's done in just a few steps, and you don't need to pay an agent for this service. If you have a spare car keys, this is the best method to avoid having to pay for towing and dealer fees. First, you'll need to purchase a replacement battery for the fob. You can buy one at a big box retailer or hardware store for around $10. To open the fob, you'll require a flathead screwscrew. The screwdriver's head should fit inside a tiny slot or space on the side of the fob. After you've removed your case you'll need replace the old battery with the new one. Now it's time to set up the new key fob for your vehicle. To do this, insert the working key into the ignition and then turn it ON. It should be on for about five seconds then switch it off. Repeat the process with another key that is working, and then the new (or additional) key. Once you have done this, your Mazda should be able to be initiated using the newly-programmed keys. If not then there could be a issue with the key fob or vehicle.