The breadth of Volkswagen AG crisis isn't clear, but it's getting bigger. The scandal, when it broke in September, was about one pollutant in one type of engine and VW brand. Now the EPA's charges of emissions-rigging have pulled in Porsche and Audi. VW's own investigation has found inaccurate emissions ratings assigned to some 800,000 cars, not all of them diesels. “It's a like a virus that's spreading,” said Dave Sullivan, an analyst with AutoPacific.