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The 2012 Nissan Maxima uses a CR2032 battery for its key fob. This type of battery is widely available and can be found at most grocery stores, pharmacies, and big box stores across the country. If your key fob is not working, the first step is to replace this battery. To do so, you will need to take out the physical key from the fob and then carefully separate the fob at its center. Once opened, you can remove the old battery and insert the new one ensuring it has the same orientation as the old one. After that, the key fob should function properly with your car.
The CR2032 battery is what you need to swap out the battery in your 2012 Nissan Maxima key fob.
How many batteries are needed?