Generic OBD-II scanners can’t read the full range of manufacturer-specific...

https://holdenlvxt779.theburnward.com/how-do-i-know-if-a-workshop-really-specializes-in-continental-cars

Generic OBD-II scanners can’t read the full range of manufacturer-specific codes European cars throw out. Missing those means risks of misdiagnosis and repairs that don’t stick