Modern cars aren't just mechanical anymore. They run on a complex network of...

https://sticky-wiki.win/index.php/How_Repair_Shops_Use_Real-Time_Sensor_Data_to_Find_the_Exact_Fault

Modern cars aren't just mechanical anymore. They run on a complex network of ECUs that communicate in languages basic code readers simply cannot translate. If you rely on a generic scanner, you are only seeing a tiny fraction of the picture