Yes the CEL is worthless, but OBD is very informational and a reader isn't really that expensive. A modern car ECU can tell you things like a specific cylinder

Yes the CEL is worthless, but OBD is very informational and a reader isn't really that expensive. A modern car ECU can tell you things like a specific cylinder misfire, so you can check that spark plug etc. If my motherboard is fucked it's probably just giving some incredibly generic error.