How did Volkswagen's diesel defeat device work?

Volkswagen TDI 'clean diesel' television ad screencapEvery media outlet in the world covered Volkswagen's tangled web of lies and deceit as "Dieselgate" opened up and spewed the truth nearly three years ago. Its consequences are ongoing today, and VW's future trajectory has been changed forever. But, how exactly did VW's "defeat device" work? Jason Fenske, host of Engineering Explained, breaks it...

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