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How to Fix Common Mazda 3 Key Problems The Mazda 3 is an elegant compact car that has a luxurious interior and agile handling. It's also a huge deal less expensive than other compacts available. It can be a huge trouble to lose keys. It's not just that you'll be paying the dealer to tow your car and reprogramme your key as well, but it could also cost money to replace the spare keys. The key will not lock or unlock the door If doors are not locked, it can be dangerous, especially if the vehicle is moving. If the door is opened while the vehicle is moving, it can cause passengers to fall or get injured. Keep keys out of the reach of children to avoid this issue. Children might find them fascinating and may play with them, which can cause the power windows or other controls to function and even cause the vehicle to move. If you notice that the key fob doesn't lock or unlock the doors, the battery may be dead. The button-cell battery in the key fob has a finite lifespan, which is why it's important to replace it on a regular basis. A good battery is expected to last between two and three years. When replacing the battery, it is essential to use a battery with the same voltage and size as the original one. A key pairing issue could also be the cause of your key fob not working. It's possible that the keyfob was not properly connected to the vehicle at the time it was purchased. In this instance the dealer will have to reprogram the key fob. This can be accomplished in under 30 seconds. The dealer can also reset the on-board computer to erase any remaining electricity. This will not fix your key fob's inability to lock or unlock doors. Dead coin battery If your key fob is not working or unlocking your car, it may be due to the battery being dead. It's a common problem, but one that can easily be repaired. You can replace the battery yourself, saving you having to visit a dealership. The process is easy and requires only some basic tools. Press the auxiliary key button located on the back of the Mazda flip key. This will allow you to take off the auxiliary keys made of metal. There will be an opening on each side of the case once the auxiliary's metal is removed. Make use of a tape-wrapped flathead screwdriver to break open the case starting with one side first and then the opposite. Gently pull the two sides of the case and place them aside. Now you'll be able to see the inside of the key fob's battery, so you can replace it. Be mazda 3 key fob replacement not to damage the ring of rubber that the battery is placed on. After the battery has been replaced, you can put it back in your case and use the new key fob. You can purchase replacement batteries at many stores that sell batteries. Search for a CR2025 battery. These batteries are commonly used in watches and calculators, but they can also be purchased at auto parts stores, or online. It's simple and fast to replace the battery in your Mazda 3. This will save you money by avoiding the hassle of a visit to a dealer. Key Pairing Issue If you've been driving your Mazda 3 for a long time, but it suddenly stopped working, there might be a problem with the remote keyless system receiver module. This is particularly likely if the key fob's internal chip is damaged. This could be due to a number of reasons, including dropping the key or exposure to water. The electronic components of the key fob are protected by rubber seals, so a splash of rain shouldn't cause any damage. However, submerging it into swimming pool or ocean water can be a much more serious problem because the highly conductivity of salt may cause damage to the electronic components. If your key fob isn't working, it's likely that you're in need of new batteries. A quick search on internet will reveal that there are numerous third-party replacement batteries. However, it's crucial to be aware that they may not be compatible with your Mazda 3. It is best to purchase from a dealer to make sure that it's compatible with your Mazda 3. After replacing the battery, you'll be able to use your key fob for the first time. However, if the remote isn't responding when you press the lock button, the key is probably stuck in power-saving mode. Press the lock button 5 times and hold it for a while until the red light flashes. Reprogramming an encryption key The keyless entry system of a Mazda allows you to open and start the car without using the standard key. It's an excellent convenience, however the process of programming the remote or key could be confusing for some people. It also requires a special machine that only the dealer or automotive locksmith has access to. The machine is connected to the computer in the vehicle, and it begins the process of programming for the new key or remote. The first step is to ensure that you have at least two keys that function for the Mazda. You can then proceed with changing the program of a spare one. The functions of the new FOB will be temporarily turned off to protect the vehicle from theft. After you've reprogrammed the new key, these functions can be activated once more. You can now use the new key for the ignition as well as for opening the doors. Test it first to make sure it is working. If you're worried about losing the keys, it's a good idea to keep a spare key on hand. It's easy to add an extra Mazda key. Just follow these steps and save a lot of money since you do not have to pay a dealership to do it for you. This will also help you avoid the cost of towing, as well as saving money on a spare key.