https://www.audi-sport.net/xf/threads/vcds-users-map.184967/ This is your direction for vcds it is an advanced diagnostics system https://www.ross-tech.com/vag-com/ hopefully this can be of some help.
So a step in the right direction might be to get a vcds scan I doubt very much the air filter has got anything to do with it and presume it's been ok since the oil change
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https://www.vagcarcoding.com/services/adaptation_coding/supported_vehicles/audi/audia38v/ see if this is of any use.
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