The charges are related to a 2015 scandal when VW admitted it had equipped around 11 million vehicles with devices capable of producing fake carbon dioxide emission readings during tests.
Martin Winterkorn was CEO when Volkswagen fitted 11 million diesel-powered vehicles worldwide with "defeat devices" – software that made them appear to pollute less during lab tests.
The number of people accused in connection with the "dieselgate" emissions cheating scandal has risen to 37 from 21.
Troubles for the German automaker have not yet ended as it still faces similar legal battles in other countries.
Volkswagen and US Justice Department reach deal in principle on excess diesel emissions of 600,000 cars including buyback offer
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