Generic OBD-II scanners might catch basic faults, but European cars often hide...

https://hotel-wiki.win/index.php/Is_It_Normal_for_a_European_Car_Specialist_to_Charge_for_Diagnostics%3F

Generic OBD-II scanners might catch basic faults, but European cars often hide manufacturer-specific codes that only specialists can read. Add in the risk of counterfeit parts causing more harm than good, and it’s clear why expertise matters