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A Volkswagen Golf TDI diesel car undergoes an emissions inspection at a garage in Frankfurt am Main, eastern Germany, on September 21, 2015. Shares in German auto giant Volkswagen plummeted more than 20 percent after it emerged that nearly half a million of its diesel cars in the United States had been fitted with software that falsified emissions data. AFP PHOTO / DPA / PATRICK PLEUL   +++   GERMANY OUT        (Photo credit should read PATRICK PLEUL/AFP/Getty Images)
A Volkswagen Golf TDI diesel car undergoes an emissions inspection at a garage in Frankfurt am Main, eastern Germany, on September 21, 2015. Shares in German auto giant Volkswagen plummeted more than 20 percent after it emerged that nearly half a million of its diesel cars in the United States had been fitted with software that falsified emissions data. AFP PHOTO / DPA / PATRICK PLEUL   +++   GERMANY OUT        (Photo credit should read PATRICK PLEUL/AFP/Getty Images)

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    German media: Top Volkswagen managers knew about cheating

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German media: Top Volkswagen managers knew about cheating

For how long did top employees know about the emissions manipulation? German prosecutors have launched a probe against the now former CEO of Volkswagen, Martin Winterkorn. CNN's Rene Marsh reports.

German media: Top Volkswagen managers knew about cheating

For how long did top employees know about the emissions manipulation? German prosecutors have launched a probe against the now former CEO of Volkswagen, Martin Winterkorn. CNN's Rene Marsh reports.