VW rocked by emissions scandal as prosecutors come calling

In this Nov. 20, 2008, file photo a Volkswagen Jetta TDI diesel engine is displayed at the Los Angeles Auto Show.

BERLIN -- Volkswagen, the world's top-selling automaker, lost a stunning 17.1 percent of its value Monday after admitting that it intentionally rigged nearly half a million cars to defeat U.S. smog tests.

The Obama administration, meanwhile, announced it is expanding its investigation of what it's calling "defeat devices" in diesel vehicles, to make sure other manufacturers aren't using similar schemes to thwart federal Clean Air laws.

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* Volkswagen's reputation erodes as diesel emissions scandal widens * VW unveils new Passat design for 2016 * For 7 years, VW software thwarted pollution regulations * Sohn: What was Volkswagen thinking? * Cooper: VW brand on the line * VW scandal has TN officials fuming after giving millions in incentives * Volkswagen tells dealers to stop selling 2015 diesel cars * Cooper: VW's alleged emissions 'defeat device' disheartening* VW could be fined $18 billion for cheating on emission rules* VW stock crashes after admitting it rigged U.S.