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Mazda 3 Key Fob Replacement Mazda 3 owners may need to change the battery in their keyfob in time. This is an easy task that you can accomplish yourself. Find the small button at the back of your key fob. Press the button and remove the cover. Lost Keys Prior to the 1990s losing your car keys was an annoyance that was not a major inconvenience. It was relatively inexpensive to replace them at any hardware store, dealer or locksmith. Your car's high tech key fob does more than just lock and unlock the car. But that added convenience comes with the cost of replacements. The key fob is equipped with an embedded security chip within it that sends a unique code that is sent to the car's computers to allow you to unlock and start the engine. The key fob is also able to manage other features like opening your windows in the hottest parking space and summoning the car to you, allowing you to reverse it into tight spaces (a feature available on some Genesis GV60 sedans and Hyundai Sonata sedans). Luckily, Mazda's remote fobs aren't as costly as those from other automakers. You can even change the battery in your key fob yourself with a little amount of knowledge. To do this, you'll need a small screwdriver with a flat head, an updated CR2025 battery, and your key fob. Make sure to utilize the directional buttons and red button to unlock and lock the doors prior to changing the battery. If you're looking to save money on a Mazda 3 key fob replacement find one on eBay that is OEM and does not require programming by a locksmith or dealer. You'll find many options on eBay however they may not be the same colour or logo as your current key fob. Lockouts A driver who is locked out of their car is among the most unpleasant things that can occur. There are several tricks drivers can employ to gain entry into their car. The first step is calling the local locksmith or Mazda dealership. This is a good idea as it's likely be cheaper and faster than calling a truck. The dealer or locksmith will require a key code from the database to cut you a new key fob which usually costs around $100. This is why it's crucial to keep this code in a secure place. If you are stuck in the car, the second thing to do is search for an auxiliary key located under the car's 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. The emergency override function is a different way to gain access to the car that is locked. This allows the key fob to take over the functions that are suspended by the theft-deterrent system. This usually triggers the danger warning lights and emit a signalling that the doors, fuel-filler lid or liftgate have been shut. Transponder Chips If the key fob you have has a transponder chip built into the head of the key with the L shape, you'll have to visit a locksmith or dealer to replace it. These chips come with a unique identification number that is used by your vehicle to start the engine. The antenna ring emits a burst radio frequency energy when you insert your key made of metal and turn it on. This energy reaches the chip transponder within the key. The chip responds by sending an encryption code to the ring. This informs the car that the key is in good condition. The majority of Mazdas have transponder chips that have a rolling code that changes each time you turn it. This means that the key you're using will never be compatible with your vehicle until you've got a duplicate that has the exact same code in the ignition cylinder. It's not that difficult to make your own replacement keys. If you can locate a key that works then insert it into your Mazda. Then, turn the ignition ON. You can copy the data from the key to another key, if it starts your Mazda. You can also use the eraser process on your key fob to remove the current code, if needed. This method isn't certain to be successful as transponder chips that are that are recycled might not work properly. Programming Losing your car key is expensive and time-consuming. Luckily, Mazda has made it easy to add an additional key. It's done in a couple of steps and you won't have to pay a dealer for this service. You can avoid paying for towing or dealership charges if you have an extra car key. The first step is to buy a new battery for the fob. G28 Car Keys can buy one at a hardware store or big box retailer for around $10. To open the fob, you'll need an screwdriver with a flat head. The screwdriver's tip should fit into tiny slots on the back of the fob. After taking the case off, replace the battery that was in it. Now you can program your new key fob. Insert the first key that operates into the ignition and turn it ON. After about five seconds, then switch off the ignition. Repeat the procedure with a second working key, then your new (or spare) key. After this is done your newly programmed key should be capable of starting your Mazda. If it does not then there could be a issue with the key fob or the vehicle.