If the Honda CR-V key fob is not working then You have a dead battery. All key fobs use the same type of battery, which is a cr2032 battery. These are small coin-shaped batteries and they will cost You about 5 dollars each on average. You can find them in the same place You would normal batteries. To change the battery You will need to remove the back panel of the fob. Some fobs are different than others. You may be able to simply pull down on the back and have the piece slide off. If so then You can simply remove the old battery and put the new one in its place. However, You may need to remove a couple of tiny screws before You can do this. They are not hard to get out, as long as You have a small enough screwdriver on hand.
Kevin
August 16, 2023
Hello! I just found this forum with the EXACT same problem and I thought I'd share my own issue. Turns out the metal strip that makes contact with the + side of the battery (it's on the side, under the plastic tabs that hold the battery in) was pushed in and was NOT making contact at all - I guess the act of removing the old battery had pushed it over two little plastic bits that are supposed to keep it touching the battery. I got a pair of tweezer and (GENTLY) pulled the metal ends of the strip forward OVER the little plastic bits so they spring forward and contact the battery when you insert it. Everything instantly worked!
Brian E.
April 10, 2020
The two most common things for this is the battery to go bad, and for the key fob to loose its connection to the car it is paired with.
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