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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.

The German automaker admitted last week that it used special software to fool U.S. emissions tests for its diesel vehicles. About 11 million VW diesel cars built since 2008 are affected by the scandal.

German weekly Bild am Sonntag reported that VW's internal investigation has found a 2007 letter from parts supplier Bosch warning Volkswagen not to use the software during regular operation.

Separately, the Frankfurter Allgemeine Sonntagszeitung reported that a Volkswagen technician raised concerns about illegal practices in connection with emissions levels in 2011. The weekly also cited VW's internal investigators.

A spokesman for Volkswagen declined to comment on the reports, saying that as a matter of principle the company wouldn't comment on what he called "rumors and speculation."

"Volkswagen is working with all its strength to conduct a thorough and merciless investigation of this matter," Andreas Lampersbach said in an email.

VW would hold those responsible for rigging the emissions test to account and discuss technical solutions for the problem with authorities, he said, citing a statement by the company's supervisory board. "Afterward we will provide a timetable to modify the vehicles of affected customers. This will take several weeks."

Italian media reported on Sunday that Volkswagen's Italian unit has sent a letter to all of its dealers to stop selling cars that have the affected diesel engine. According to the news agency ANSA, the letter said it was "a precautionary measure."

The daily Corriere della Sera said the move would affect 40,000 vehicles and deal a blow to car dealers, a sector that has been losing money for 10 years and finally seemed to be emerging from the crisis.

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