While some hardware stores may be able to program a modern car key, it’s something most folks end up at their car dealer for—or a locksmith, if you’ve lost a key altogether.

Watch this video to see how to change the battery in your key fob. How to replace car key battery Most key fobs have a little slot you can use to pop them open with a small flatheaded screwdriver ...

Q: I want to get a key fob (I only have one) for my car. Can an aftermarket key fob be programmed by anyone other than the dealer? The dealer tells me it will cost $400 or slightly more.