Modern vehicles are basically computers on wheels. When a check engine light...

https://medium.com/@rachel-huang00/my-scan-tool-will-not-access-abs-or-airbag-modules-ff8c3bc396ea

Modern vehicles are basically computers on wheels. When a check engine light pops on, a basic OBD reader only gives you a surface-level code, which is like reading the back of a book instead of the story