The world's second-largest car manufacturer has admitted fitting more than 11 million cars with a device that cheats carbon emissions testing.
The number of vehicles affected is more than the number of vehicles Volkswagon makes in one year.
Any doubt that financial investors don't care about a manufacturer's climate responsibility was quickly dashed as VW's share price dropped by a third on Monday, or around 25 billion EUR.
Good news for supporters of fossil fuel divestment campaigns, bad news for VW.
The cars were made to cheat emissions testing by being fitted by a device that recognises when it is being tested and quickly cuts emissions to a level much lower than normal - one it could never sustain under regular driving conditions.
So far VW's Chief Executive has refused to quit, and been forced to face the public amid news reports that he will be succeeded by a new boss this Friday.