"According to the complaint, Volkswagen will not be able to comply with the EPA order to make the affected vehicles comply with emissions standards without substantially degrading their performance and fuel efficiency to a level below what was advertised." The lawsuit mentions that the scandal came to light last month after the EPA issued a notice of violation to Volkswagen based on information gathered during a study at West Virginia University. The violation sites the company for failing to comply with the Clean Air Act regulations in 482,000 diesel vehicles sold in the United States since 2008. Volkswagen CEO Martin Winterkorn resigned shortly after admitting the company's actions. According to the Environmental Protection Agency, the following Volkswagen diesel models have been affected: 2009-2015 VW Jetta; 2009-2015 VW Beetle; 2009-2015 VW Golf; 2014-2015 VW Passat; and 2009-2015 Audi A3.