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The logo of German car maker Volkswagen can be seen as dark clouds hang in the sky over a Volkswagen trader in Hanover, central Germany, on September 22, 2015. Share prices on the Frankfurt stock exchange fell more than 3.0 percent in midday trading on September 22, 2015, pushed down by index heavyweight Volkswagen, as it ploughed ever deeper into a pollution cheating scandal.   AFP PHOTO / DPA / JULIAN STRATENSCHULTE   +++   GERMANY OUT        (Photo credit should read JULIAN STRATENSCHULTE/AFP/Getty Images)
The logo of German car maker Volkswagen can be seen as dark clouds hang in the sky over a Volkswagen trader in Hanover, central Germany, on September 22, 2015. Share prices on the Frankfurt stock exchange fell more than 3.0 percent in midday trading on September 22, 2015, pushed down by index heavyweight Volkswagen, as it ploughed ever deeper into a pollution cheating scandal.   AFP PHOTO / DPA / JULIAN STRATENSCHULTE   +++   GERMANY OUT        (Photo credit should read JULIAN STRATENSCHULTE/AFP/Getty Images)

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    3 things you need to know about the Volkswagen scandal

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3 things you need to know about the Volkswagen scandal

You might have heard that VW has admitted to cheating on emissions tests. But how did they do it? Auto expert Peter Valdes-Dapena explains everything you need to know.

3 things you need to know about the Volkswagen scandal

You might have heard that VW has admitted to cheating on emissions tests. But how did they do it? Auto expert Peter Valdes-Dapena explains everything you need to know.