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Remote Key Fob Repairs Check the battery first to determine if the remote key fob is not working. This is typically the reason of your car not responding to its commands. A new battery is likely to solve the issue however if it doesn't work, there could be a second problem. Fortunately, a lot of these issues can be solved with a few simple steps. Check the Battery The key fob has numerous functions. It can lock and unlock your car remotely and turn on the interior lights and even start