Generic OBD-II scanners can only read basic codes, missing the intricate faults...

https://speedy-wiki.win/index.php/How_to_Explain_a_Problem_to_a_European_Car_Specialist_so_They_Diagnose_Faster

Generic OBD-II scanners can only read basic codes, missing the intricate faults in European cars. Manufacturer-specific diagnostics unlock precise insights, which means quicker, accurate fixes