Modern cars are basically rolling computer networks. When you only use a basic...

https://wiki-square.win/index.php/Why_EVs_and_ADAS_Are_Forcing_Every_Independent_Shop_to_Upgrade

Modern cars are basically rolling computer networks. When you only use a basic code reader, you are just getting a surface-level hint instead of the full story. You need professional diagnostic software to talk directly to every ECU in the vehicle