A Volkswagen 2016 Touareg TDI is seen at a VW dealership in the Queens borough of New York, September 21, 2015. Volkswagen shares plunged more than 20 percent on Monday, their biggest ever one-day fall, after news that the German carmaker had rigged U.S. emissions tests, and Germany said it would investigate whether data had been falsified in Europe too. REUTERS/Shannon Stapleton