Relax
Well-known member
I've never been charged a diagnostic fee when bringing a car in for a problem while still under the original warranty, even if it turned out to be not covered. Our newest car is a 2019 VW, so clearly not all brands do, unless the dealerships are being inconsistent (which they shouldn't be).It's pretty normal to be quoted a diagnostic fee while under warranty, it serves a few purposes. Main one is if the issue is not warrantable for whatever reason. If the diag fee was not quoted, the shop would not be able to come back to you and ask you to pay because of the Consumer Protection Act. They still have to pay their tech for his time and end up eating it internally. Of course if the issue is under warranty, that takes care of the diag time and everyone is happy.
As for the brand discussion. Each dealership (Mercedes has some corporate owned) is effectively an independent entity from the manufacturer. Your positive or negative experience at one dealer should not greatly reflect your perception on the brand as a whole. There are good and bad dealerships amongst all brands, and the quality of their service can change very quickly depending on staffing.
I do agree that there is a huge discrepancy in the quality of different dealers for the same brand.