Sales of vehicles bearing the Volkswagen badge fell 5 percent to 5.82 million, the company said, marking the first such decline in 11 years.
Overall VW group sales, which also include brands like Audi, Porsche and Skoda, reached 9.93 million, 2 percent less than a year ago and the first fall since 2002.
"Almost 10 million vehicles sold -- that's an excellent result given a difficult situation in certain regions and for diesel in the last quarter," said chief executive Matthias Mueller.
Volkswagen sank into its biggest crisis over its stunning revelations in September that it had fitted 11 million of its vehicles with devices designed to cheat pollution tests.
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Earlier this week, the US government said it was sueing VW for USD 20 billion in civil penalties.
Mueller is travelling to the United States where he will attend a media reception in Detroit on Sunday.
He has vowed to press on with the company's diesel marketing offensive in the US despite the government lawsuit.