A diesel emissions test you can’t game? We try it out

Bosch provided flights to Frankfurt and three nights' accommodation for this trip to the Bosch Mobility Experience.

Jonathan Gitlin

BOXBERG, Germany-Diesel is a dirty word in the auto industry these days. The fuel was once viewed-particularly in Europe-as a potential savior, since diesel engines offer much better fuel economy and emit much less CO₂ per mile than engines that run on gasoline. But that changed once Volkswagen Group was caught cheating its emissions tests, resulting in billions of dollars of fines and a loss of public trust. Automotive-component maker Bosch had a hand in the mess, too-it provided the code on the Engine Control Units in VW Group's offending diesels. The supplier ultimately paid out several hundred million dollars in settlement in the US, although it was not required to admit any wrongdoing.

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