Modern cars are basically rolling networks. Your basic OBD reader only gives...

https://cesarsniceperspective.wordpress.com/2026/04/16/how-repair-shops-use-real-time-sensor-data-to-find-the-exact-fault/

Modern cars are basically rolling networks. Your basic OBD reader only gives you a surface-level trouble code, which is like guessing the sickness without looking at the symptoms