Volkswagen diesel scandal: 10 key dates

The fallout stemming from Volkswagen admitting cheating on diesel emissions tests became global news just a few short months ago, but the scandal has roots dating back several years. Read on for a timeline of what happened. 

5. Sept. 21, 2015

Reuters/File
Volkswagen CEO Matthias Mueller poses next to an Electro-Golf police vehicle during a tour of the VW factory in Wolfsburg, Germany October 21, 2015.

Sept. 21, 2015: As the fallout from the cheating scandal worsens, Volkswagen stock takes a dive. Shares plunge 20 percent, or one-fifth of the automaker's total value, in a single day.

"No question that this is a big problem for Volkswagen and could lead to CEO Martin Winterkorn losing his job after all," Christian Stadler, a professor at Warwick Business School, tells CNN Money.

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