Your car key fob is a small but mighty device. Have you ever wondered what would happen if it died while you were, say, at the grocery store? How do you start your car (or even get into your car!) ...

Of course, programming a key fob won't take all day — but it's not a quick fix either. The time required to reprogram these devices depends heavily on factors like the vehicle's make and model ...

How to start your car with a dead key fob. In a video with over 348,000 views, the TikTok account for McGrath BMW of Elmhurst (@bmwofelmhurst) explains how one can start their car with a dead key fob.

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.

We're hoping you saved that tag, or at least memorized the number on it, because if you find yourself with a dead or malfunctioning key fob, you'll need the PIN to crank up your Harley-Davidson.