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.