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In the key fob of a 2012 Honda Civic, you'll find a CR1616 battery, a common size that can be easily purchased at most drug stores, supermarkets, and large retailers. To replace the battery, simply open the fob at its center and insert the new one. Your car's dashboard will alert you when the battery is running low, signaling the need for a replacement. A dead battery will prevent the fob from communicating with the vehicle's receiver, rendering the car unable to start.
You will require a 3-volt coin cell battery for the key fob of a 2012 Honda Civic.