If you’re still relying on a basic code reader, you’re only seeing the surface....

https://wiki-velo.win/index.php/OBD2_Scanner_vs._Dealer_Diagnostic_Software:_What_is_the_Difference%3F

If you’re still relying on a basic code reader, you’re only seeing the surface. Modern vehicles use a complex network of ECUs that manage everything from engine timing to cabin comfort