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

https://www.tumblr.com/coldveilaether/814009653218492416/mastering-scan-tool-live-data-moving-beyond-the

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