VW was reportedly warned about illegal emissions tricks year ago

Piezas con el logo de la marca Volkswagen depositadas en una caja en Berlín, Alemania, el 23 de septiembre de 2015. (Foto AP/Michael Sohn)
photo FILE - In this Sept. 23, 2015 file photo, company logos of the German car manufacturer Volkswagen sit in a box at a scrap yard in Berlin, Germany. Who knew about the deception, when did they know it and who directed it? Those are among questions that state and federal investigators want answered as they plunge into the emissions scandal at Volkswagen that has cost the chief executive his job, caused stock prices to plummet and could result in billions of dollars in fines. Legal experts say the German automaker is likely to face significant legal problems, including potential criminal charges. (AP Photo/Michael Sohn, File)

German media reported Sunday that Volkswagen was warned years ago about the use of illegal tricks to defeat emissions tests.