When the battery is removed from the key fob, the fob can lose its ‘memory’ or programming. If the key fob is not working after replacing its battery, a reprogramming procedure may be required.

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.

Prilutskii_Evgenii // Shutterstock What you need to know about keyless ignition systems An engine start and stop button for a keyless car.