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

https://wiki-club.win/index.php/Can_a_Normal_Workshop_Read_BMW_Manufacturer_Fault_Codes%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