This is how my buddy blew the engine on his insight. It was burning oil so long that it melted the spark plugs. He could have had it fixed for free but he didn't know about it until that extension had ended.

I actually don't know what was wrong with it because he never let me take a look for him. I offered to have an engine delivered to my house and me and another friend could have slapped a used engine in.

He was hellbent on buying a new car so he traded it in.

It's only $50 if you can do it yourself, don't value your time, and already have the tools.

Exactly. All the memes and stickers about letting the CEL stay on are funny, but if you don't know what code is triggering the light, you are gambling with your car, or even your safety. Seriously people, get a CEL checked out, and then decide if you feel it's worth fixing. Most auto parts stores, dealers, etc. will happily do it for you, often at no cost, but at least be an informed consumer instead of just hoping it will be okay.