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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 a nimble handling. It's also a great bargain for the price compared to other compacts on the market. It can be a real trouble to lose keys. It can be expensive to replace keys that are lost, as well as taking your vehicle to a dealer to reprogram your key. The key does not lock or unlock the door. The doors left unlocked can be very dangerous, especially when the vehicle is moving. If the door is unlocked while the vehicle is moving passengers could be thrown out or injure themselves. To avoid this risk, you should always keep your keys out of the reach of children. Children may find them interesting and enjoy playing with them. This could cause the power window or other controls to be activated and even move the vehicle. If you notice that the key fob is not locking or unlocking the doors, it's likely that the battery is dead. The button-cell battery inside the key fob has a finite life span, so it is important to replace it on a regular basis. A good battery will last between two and four years. It is crucial to replace the battery with a new one that has the same voltage and the same dimensions as the initial. Another reason why the key fob may not be working is a key pairing problem. It's possible that the keyfob wasn't properly associated with the vehicle when it was purchased. In this case, it will need to be reset by the dealer. Fortunately it is possible to do this in under a minute. The dealer can also reset any residual electric current in the onboard computer. But, this will not fix the key fob's ability to lock or unlock the doors. Dead coin battery It's possible that the battery is not functioning properly if your key fob won't turn on or unlock your vehicle. This is a typical issue but it can be easily fixed. You can replace your battery at home and avoid a trip to a dealership. The procedure is easy and requires just two tools. First you need to press the auxiliary button on the back of your Mazda flip key. This will open the metal auxiliary key and allow you to remove it. You'll see a slot on each side of the case after the auxiliary's metal is removed. Use a tape-wrapped flathead screwdriver break open the case beginning with one side, and then the opposite. Gently pry the two halves of the case apart and set them aside. Now mazda key replacement 'll have a clear view of the battery in the key fob and you can replace it. You don't want damage to the rubber ring on which the battery is fixed. After the battery has been replaced, you can put it back into the case and take pleasure in your new key fob! The majority of stores selling batteries will have a spare battery. Look for a CR2025 coin cell battery. These batteries are typically used in watches and calculators, however, they can also be found at auto parts stores or online. It's simple and fast to change the battery in your Mazda 3. This will save you money by avoiding an appointment with a dealer. Key pairing issue If you've been driving your Mazda 3 for a long period of time, and then it suddenly stopped working, there may be a problem with the remote keyless system receiver module. It is more likely to occur when the internal chip of the key fob has been damaged. This could be the result of various factors, such as dropping the key or exposure to water. Fortunately the key fob's digital chips are protected by rubber seals and will be fine with the splash of water. However, submerging it in the pool or ocean water is a much more serious problem due to the highly electrically conductive nature of salt can harm the electronics. If your key fob does not function, you might require an upgrade to the battery. You can find a variety of third-party batteries on internet. But, it's important to keep in mind that they might not be compatible with your Mazda 3. It's recommended to purchase one from a dealership and make sure that it's 100% guaranteed to work with your vehicle. Once you've replaced the battery the key fob will be working again. If the remote does not respond when you press on the lock button, it is likely that the key has been stuck in power saving mode. To remove it from this mode, you'll need to press the lock button five times and hold it until the red light appears. Reprogramming the key Mazda's keyless entry feature allows you to open the door and begin it without the need for a traditional key. It's a great feature, but the process of programming the key or remote can be confusing for some. This also requires a machine that is only available to the locksmith in the car or dealer. This machine is connected with the car's computer and it starts the programming process for the new key or remote. The first step is to have at least two functioning keys for the Mazda. You can then proceed with the reprogramming of a spare key. The functions of the new FOB will be temporarily removed to protect the vehicle from theft. Once you have reprogrammed your new key, these functions can be activated again. You can now use the new key for the ignition as well as to open the doors. You should first test it to verify that it functions. Keep a spare set of keys if you're concerned about losing your keys. It is simple to add a spare Mazda key. Just follow these steps and save a significant amount of money since you do not have to pay for the dealership to complete the task for you. This will save you money on towing costs and a spare key.