The last recall that the 2013 S5 had was airbag related, and some people were reporting loss of custom vagcom settings after having the recall performed. When I had the recall performed I shared my concern with my service advisor and tech. The tech showed me the screens while he was doing it, and there was an option that he clicked before he started. That option kept my settings in tact. I've also heard of other situations where the technician will receive popups to reset specific values back to OEM while performing an update, and some people suspected this was their custom vagcom settings. I read about that before I had even taken my car in, so I asked my technician about it. He said that some screens do behave that way, but if he had a list of the vagcom mods I had in place, he would make sure they went untouched.
So just to make life easy, my service record/customer file has my vagcom mods notated so any technician can be mindful of them.
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