If you have a newer car, you may have a battery-powered smart key with a lot of really convenient features. But what do you do if that battery dies?

The keyless car is a marvel of engineering. But how is it that they can start even when the battery in your key fob goes dead? The answer lies in science.

To start the engine, most cars with smart keys have a push button that fires up the engine before you even get in the car.

Electronic keys introduce new components that can be expensive, even without paying a dealer to program them. If you can do the job yourself, you can save both time and money by not having to visit ...