Typically, a Ford Fusion key fob battery requires two coin cell battery units, which are part number CR2025. These key fobs don't typically come with an ignition key. Single-Unit Battery ...

However, if you don't know your car has remote start, you can't use it. And unfortunately, that's the case for some Ford vehicle owners, especially if they bought their car used.

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.

TAMPA, Fla. (BLOOM) — You’re rushing to work, the gym, or the grocery store when it happens — you press your key fob, and nothing. No clicks, no unlock, no start. If your car key fob battery ...

The DB9 in question did not, the fob has to be present and in working order for the car to start. As a side note, I’m also amazed most people don’t know that most key fobs have a small key ...