Why I put the scanner down and just listen to the engine
I know lots of mechanics swear by their fancy scan tools, but I think we rely on them too much. Recently, a guy brought his truck in with a shaky idle. Instead of hooking up the computer, I just popped the hood and listened. There was a faint ticking from the passenger side. Turned out to be a loose rocker arm, something a scan tool might not catch. I tightened it up in five minutes, and the truck purred like new. Sure, computers have their place, but they can't hear what we can. Trusting my ears has helped me fix things faster and saved people cash. It's a skill every mechanic should try more.