Modern cars are basically rolling computer networks. When a warning light pops...

https://www.tumblr.com/coldveilaether/814017035806851072/why-evs-and-adas-are-forcing-every-independent

Modern cars are basically rolling computer networks. When a warning light pops up, your basic code reader only gives you a surface-level glimpse. You need diagnostic software to talk directly to the individual ECUs and pull high-speed live data