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.

Programming a Single Key A handful of manufacturers will allow you to program a single key, even if you don’t have a key that works. Keep in mind that you’ll still need to have the key cut to fit the ...

In this primer on how to replace a car key fob, Consumer Reports says getting another high-tech key fob can be a pricey proposition.