In another interesting turn of events, the Volkswagen Group (VW) may face additional violations as the Environmental Protection Agency (EPA) recently accused the German automaker of installing “defeat devices” in its Porsche, VW and Audi, subsidiaries.

A “Notice of Violation” on the EPA’s website confirms that the regulator found that 2014 to 2016 VW, Audi and Porsche models are equipped to automatically turn off emissions systems when they are not being tested.