I have simple idea: Cars should come with a USB port and software so that when the check engine light is on, people can diagnose it themselves. Upvote if you want car manufacturers to see this. If you didn’t guess, yeah, the check engine light is on in my car. It sucks that I have to bring it in to a shop just to see what it is. We’re well into the digital age, and if car manufacturers are looking for ways to add value, this might be a good idea.