Modern vehicles are essentially rolling computers with dozens of interconnected...

https://www.bookmark-step.win/if-you-re-still-relying-on-a-cheap-obd-reader-you-re-missing-the-full-story

Modern vehicles are essentially rolling computers with dozens of interconnected ECUs that control everything from your engine timing to your door locks. Basic OBD readers only scratch the surface by pulling generic codes, which often leaves you guessing