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Mazda 3 Key Fob ReplacementThere are times 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 on the back of your key fob. Press it and then take off the cover.Lost KeysPrior to the 1990s the 1990s, losing your car keys was a minor inconvenience. It was relatively cheap to replace them in any hardware store, dealer, or locksmith. The car's high-tech key fob can do more than simply lock and start your car. However, that added convenience comes with costs - more expensive replacements.The key fob is equipped with an embedded security chip in it that sends a specific code to the car's computer to let you unlock and start the engine. The key fob can also control other functions, such as opening your windows in hot parking spaces and summoning the car to you so you can reverse it into tight spaces (a feature that is available on certain Genesis GV60 sedans and Hyundai Sonata sedans).Fortunately, Mazda's remote fobs aren't as expensive from other automakers. You can even replace the battery of your key fob yourself with a knowledge. You'll need a flathead screwdriver and a new CR2025 to do this. Be sure to use the directional buttons and red button to lock and unlock 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 doesn't require programming by a locksmith or dealer. You'll find many options on eBay, though they may not have the same design or color as the one you have currently.LockoutsA driver being locked out of their car is one of the worst things to occur. Thankfully, there are a few strategies that drivers can utilize to get back into their vehicle. First, they should consider calling the local locksmith or Mazda dealership. This is a good option since it's likely to be less expensive than calling for a tow truck and it will be faster as well. The dealer or locksmith will require a key code from the database to cut you an additional key fob, which will usually cost about $100. This is why it's important to keep this key code in a safe location.Another thing that people can do when they are stuck outside of their car is to look at the underside of the key fob to find an additional button. The button is typically a small round one that can be pressed. This will open the doors of the vehicle and allow the driver to open them manually.Another method to gain entry into a locked vehicle is by using the emergency override feature. This allows the key fob to take over the functions that are disabled by the theft-deterrent system. This will trigger the hazard lights and sound to ensure that the doors, fuel filler lid or liftgate have been shut.Transponder ChipsIf the key fob you have has the chip for transpondering built into the head of the key with the L shape, you'll need a locksmith or dealer in order to have it replaced. These chips have a unique identification number that works with your vehicle to start the engine.When G28CarKeys insert your key and turn it to the ON position, the antenna ring releases an impulsive radio frequency energy that will reach the transponder chip within the key's metal. The chip responds by sending a code to the antenna ring. This tells the car that the key is legitimate.Most Mazdas use a transponder chip with a rolling code 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 that has the exact same code in the ignition.It's not too difficult to create your own replacement key. If you find an appropriate key and fits into your Mazda. Then, turn the ignition ON. If the key starts your vehicle, you can copy the information to the working key. You could also try the eraser procedure on the key fob to erase the current code, if required. It is important to remember that this method isn't 100% guaranteed to work, since some recycled transponder chips might not be able to respond properly.ProgrammingThe loss of your car keys can be an expensive and lengthy process. Mazda has made programming and adding the third car key simple. This can be accomplished in just a few steps and you won't have to pay an agent for this service. You can avoid paying for towing or dealer fees if there is an additional car key.The first step is to buy a new battery for the fob. You can purchase one at a big box store or hardware store for around $10. To open the fob, you'll require a flathead screwscrew. The screwdriver's tip should fit in a small slot or space on the side of the fob. Once you've removed it, you'll need to replace the battery that was in the case with a new one.It's time to add the new key fob into your vehicle. To do this, put the first working key into the ignition, and then turn it on. Then, wait for five seconds before turning the ignition off. Repeat the process using a second working key, and then your new (or spare) key. Once you have done this, your Mazda should now be able initiated using the newly-programmed keys. If it's not there may be a problem with the key fob, or the vehicle.