Generic OBD readers only tell you half the story. Modern vehicles run on a...

https://wiki-nest.win/index.php/The_Shop_Floor_Reality:_Why_Diagnostics_Beat_Guesswork_in_Engine_Management

Generic OBD readers only tell you half the story. Modern vehicles run on a complex network of ECUs that manage everything from engine timing to cabin comfort. If you rely on basic codes, you are just guessing