FILE - In this Nov. 20, 2008 file photo a Volkswagen Jetta TDI diesel engine is displayed at the Los Angeles Auto Show. Green Car Journal named Volkswagen's 2009 Jetta TDI as the "Green Car of the Year" at the show on Thursday, making it the first clean-diesel vehicle to win the prize. Around 15 billion euros (US$ 16.9 billion) was wiped off the market value of Volkswagen AG on Monday, Sept. 21, 2015 following revelations that the German carmaker rigged U.S. emissions tests for about 500,000 diesel cars. (AP Photo/Damian Dovarganes)