Lemons in portfolio? Trading Volkswagen scandal

The world headquarters building of Delphi Automotive in Troy, Michigan.
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Shares of Volkswagen lost as much as a third of their value this week after the world's second-largest automaker was hit by a scandal involving deceptive software used in millions of diesel engine cars to cheat on emissions tests.

Wall Street analysts are scrambling to figure out the ramifications for the whole auto sector as the market digests the brand damage to Volkswagen from the affair.

"In the near term, we would expect the suppliers with the greatest exposure to Volkswagen to take a near-term hit to sentiment and earnings to some degree, as VW's sales will likely decline on the margin," wrote John Murphy of Bank of America Merrill Lynch in a note to clients Wednesday.

Here are the auto supplier stocks that are most at risk and overexposed to VW...