Generic OBD-II scanners only scratch the surface when it comes to European...

https://papa-wiki.win/index.php/Audi_vs_Volkswagen_Specialist_Workshop_%E2%80%93_Can_the_Same_Shop_Handle_Both%3F

Generic OBD-II scanners only scratch the surface when it comes to European cars. These vehicles use manufacturer-specific codes that require specialist diagnostics to pinpoint issues accurately