Today’s cars are rolling computer networks. You can’t fix a modern vehicle by...

https://fire2020.org/why-modern-cars-feel-more-like-computers-than-machines/

Today’s cars are rolling computer networks. You can’t fix a modern vehicle by just guessing because the ECUs control everything from fuel trims to door locks. Basic OBD readers only give you a surface-level fault code, which rarely tells the whole story