Last week was touchy for Volkswagen Group and its profitable Audi brand.

Yesterday, the German magazine Bild Am Sontag reported that the California Air Resources Board (CARB) had discovered that unspecified Audi vehicle models were running illegal software to bring carbon dioxide (CO₂) emissions within legal limit under laboratory conditions. The software, according to Bild Am Sontag, also killed CO₂ emissions controls while the Audis were driven under normal conditions, much like the defeat device scandal involving VW, Audi, and Porsche vehicles that was exposed last September.

This illegal software was apparently found in both gas and diesel Audi models produced up until May 2016. Neither Audi nor CARB has confirmed the reports to any outlet, including Ars Technica.