Volkswagen (VWAGY -1.28%) reported an operating profit of $15.1 billion in 2012. That was way ahead of earnings at both Toyota and General Motors, even though VW's global sales trailed both.

It has been a great story for the German auto giant. But that story may be in trouble: First-quarter profits were down sharply. In this video, Motley Fool contributor John Rosevear looks at the story behind the numbers -- and ponders whether VW's plans for world domination can get back on track.