Volkswagen’s in trouble, again: The United States Department of Justice has just announced it’s filing suit against Volkswagen Group for its emissions-cheating software in VW, Audi, and Porsche vehicles sold in the U.S.

The DOJ filed the suit on behalf of the Environmental Protection Agency, naming Volkswagen, Audi, Porsche, and each brand’s U.S. subdivisions. The complaint alleges that nearly 600,000 diesel vehicles sold in the U.S. were equipped with defeat devices that allowed the cars to pass emissions testing, but emit far more than the legal limit of certain pollutants in everyday driving.

“Car manufacturers that fail to properly certify their cars and that defeat emission control systems breach the public trust, endanger public health and disadvantage competitors,” said Assistant Attorney General John C. Cruden for the Justice Department’s Environment and Natural Resources Division. “The United States will pursue all appropriate remedies against Volkswagen to redress the violations of our nation’s clean air laws alleged in the complaint.”