(Bloomberg) -- Volkswagen AG’s plot to cheat emissions tests by installing so-called defeat devices in its vehicles wasn’t limited to diesel cars, but also included at least six models of Audi 3.0-liter gasoline engines, according to a consumer lawsuit.

In a class action on behalf of owners of more than 100,000 vehicles, the German carmaker’s Audi unit was accused of installing software designed to beat emissions tests in its A6, A8, Q5 and Q7 cars since February 2013 and possibly earlier. Audi executives encouraged use of the devices in gas-powered vehicles as recently as May, eight months after the diesel cheating was publicly disclosed, according to the complaint filed Tuesday in Chicago federal court.

VW spokeswoman Jeannine Ginivan and Audi spokesman Mark Clothier declined to comment on the complaint.

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