Modern cars are basically rolling computer networks. When a check engine light...

https://www.tool-bookmarks.win/modern-vehicles-are-basically-rolling-computers-when-a-check-engine-light-pops

Modern cars are basically rolling computer networks. When a check engine light pops on, basic OBD readers only give you a surface-level code. To actually fix the car, you need diagnostic software that talks to every ECU and tracks live data streams