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How to Fix Common Mazda 3 Key Problems The Mazda 3 is an elegant compact car with a classy interior and a responsive handling. It's also a fantastic value compared to many other small cars available. Lost keys can cause a lot of hassle. It can be expensive to replace keys that are lost, as well as towing your car to a dealer to reprogram your key. The key is not able to lock or unlock the door It's dangerous to leave doors unlocked particularly when the vehicle is in motion. If the door is opened when the vehicle is moving it could cause passengers to fall or get injured. To avoid this risk it is recommended to keep the keys away from children. Children might find them fascinating and may play with them, which could cause the power windows or other controls to function and make the vehicle move. If you notice the key fob isn't able to lock or unlock the doors, the battery might be dead. The button cell battery on the key fob has a short time of life, which is why it is crucial to replace it often. A quality battery will last between two and three years. It is important to replace the battery with one that is the same voltage and same dimensions as the first. Another reason for why the key fob might not be working is a key pairing problem. It's possible that the keyfob wasn't properly paired with the vehicle when it was purchased. In this instance, it will need to be reset by the dealer. Fortunately, this can be done in under a minute. The dealership can also reset any residual electrical power in the on-board computer. This will not solve your key fob's inability to lock or unlock doors. Dead coin battery It's possible that your battery is dying if your key fob won't turn on or unlock your vehicle. mazda key replacement is a common issue however, it is easily solved. You can replace the battery on your own, avoiding an excursion to the dealership. The process is easy and requires just some basic tools. First press the auxiliary key button on the back of your Mazda flip key. This will let you take off the auxiliary keys made of metal. Once the metal auxiliary key is removed, you'll see an opening on either side of the fob case. Use a tape-wrapped flathead screwdriver pry open the case, starting with one side first and then the other. Gently break the two halves before putting them aside. You can now replace the key fob's battery. Be careful not to damage the ring of rubber that the battery sits on. After the battery is replaced, you can reassemble your case and use the new key fob. The majority of stores that sell batteries carry a replacement battery. Look up a CR2025 battery. These batteries are used primarily in calculators and watches, but they can also purchased at auto parts stores, or online. Changing the battery in your Mazda 3 is easy and fast, and will save your money on a trip to the dealership. Key pairing issue If you've been driving your Mazda 3 for a long period of time, and then it suddenly stopped working, it may be a problem in the remote keyless system receiver module. This could happen when the internal chip of the key fob has been damaged. This could be the result of a number of reasons, like dropping the key or being exposed to water. Fortunately the key fob's electronics chips are protected by rubber seals, and should be fine even with splashes of water. However, submerging it in ocean or pool water is an even more serious issue because the highly conductivity of salt can harm the electronics. If your key fob isn't working, you're likely in need of a new battery. You can find a variety of third-party batteries available on the internet. But, it's important to note that they might not work with your Mazda 3. It's a good idea buy one from the dealership and make sure it's certain to work with your vehicle. After replacing the battery, you'll be able to use the key fob again. If the remote doesn't respond when you press on the lock button, it's likely that the key is stuck in power saving mode. Press the lock button five times, and hold it until the red light flashes. Reprogramming the key The keyless entry system of the Mazda allows you to unlock and start the car without the standard key. It's a great convenience but the process of reprogramming the remote or key could be confusing for some people. It also requires a particular machine that only the dealer or automotive locksmith can access. This machine is connected the vehicle's computer and starts the process of programming for the new key or remote. The first step is to ensure that you have at least two working keys for the Mazda. You can then proceed to changing the program of a spare one. Initially, the functions of the new FOB are turned off to protect the car from theft. Once you've reprogrammed the new key, it is possible to activate these functions again. You can now make use of the new key for the ignition as well as for opening the doors. It is recommended to test the new key first to make sure it works. Keep a spare set keys around if you are concerned about losing your keys. It is simple to add an extra Mazda key. You can save money by following these easy steps. This will save you money on a tow bill and a spare key.