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How to Fix Common Mazda 3 Key Problems The Mazda 3 is an elegant compact car with a premium interior and agile handling. It's also a good bargain for the price compared to other compacts on the market. It's a real problem to lose keys. It's expensive to replace keys that are lost, and also transporting your vehicle to the dealer to reprogram your key. The key will not lock or unlock the door. It's dangerous to leave doors unlocked, especially when the vehicle is moving. If the door is locked when the vehicle is in motion passengers could get out of the vehicle or suffer injuries. To avoid this risk it is recommended to keep your keys out of the reach of children. Children may find them interesting and play around with them. This could cause the power window or other controls to operate and even cause the vehicle to move. If mazda 3 car key notice that the key fob won't lock or unlock the doors, the battery might be dead. The button-cell battery on the key fob has a finite time of life, which is why it's important to replace it regularly. A high-quality battery will last between two and four years. It is essential to replace the battery with a new one that has the same voltage and the same size as the original. Another reason that the key fob may not be working is a key pairing issue. It is possible that the keyfob was not properly associated with the vehicle when it was purchased. In this instance it must be reprogrammed by the dealer. Fortunately it can be done in under a minute. The dealership can also reset the on-board computer to clear any residual electrical charge. This will not solve your key fob's inability to lock or unlock doors. Dead coin battery It's possible that the battery is dying if your key fob isn't turning on or unlock your vehicle. This is a common problem, but it can be easily solved. You can replace the battery on your own, saving an excursion to the dealership. The process is easy and requires just a few simple tools. Press the auxiliary key button located on the back of the Mazda flip key. This will let you remove the metal auxiliary keys. There is slots on both sides of the case after the metal auxiliary is removed. Use a tape-wrapped flathead screwdriver to open the case starting with one side and then the other. Gently break the two halves and put them aside. Now you'll be able see clearly of the key fob battery, so you can replace it. Be careful not to damage the ring of rubber that the battery sits on. When the battery is replaced, you can reassemble the case and enjoy your new key fob! Most stores that sell batteries also carry a replacement battery. Look for a CR2025 coin cell battery. These batteries are often used in watches and calculators however they can also be found at auto parts stores and on the internet. It's easy and quick 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, it might be a problem with the remote keyless system receiver module. This is especially true if the key fob's internal chip is damaged. This could be the result of several factors, such as an accidental drop of the key or exposure to water. The key fob's electronics are protected by rubber seals therefore a raindrop is unlikely to cause harm. However, submerging it into ocean or pool water is an issue that is much more severe, as the highly conductivity of salt can damage the electronics. If your key fob has stopped functioning, you're most likely in need of an entirely new battery. A quick search on the internet will show that there are countless third-party replacement batteries. However, it's important to note that they might not be compatible with your Mazda 3. It's a good idea purchase one from a dealer and ensure that it's sure to work with your vehicle. After replacing the battery, you'll be able to use the key fob for the first time. If the remote does not respond when you press the lock button, it is likely that the key is stuck in power saving mode. Press the lock button 5 times and hold it for a while until the red light appears. Reprogramming the key The keyless entry system that comes with the Mazda allows you to open and start the car without the regular key. It's an excellent convenience, however the process of reprogramming the key or remote can be confusing for a few people. It also requires a device that is available only to the locksmith in the car or dealer. The machine is connected to the car's computer and begins the programming procedure for the new key or remote. The first step is to have at least two working keys for the Mazda. Then you can begin the reprogramming procedure of a spare key. Initially, the functions of the new FOB are halted to protect the vehicle from theft. After you have reprogrammed your new key, these functions can be activated once more. You can now use the new key to turn on the ignition and also to open the doors. Check it out first to make sure it works. If you're worried about losing keys, it's an excellent idea to keep a spare one in your possession. Incorporating a spare car key into your Mazda is a straightforward process. Just follow these steps and you can save a considerable amount of money since you do not have to pay a dealership to do it for you. This will save you money on a tow bill and an extra key.