Hopefully this is sorted out soon and isolated to the United States and not a global issue for Volkswagen:
US accuses Volkswagen of illegal pollution
Volkswagen under investigation over illegal software that masks pollution | Business | The Guardian
EPA: Volkswagen used ‘defeat device’ to illegally skirt air-pollution controls - The Washington Post
Feds allege widespread Volkswagen cheating on clean-air rules
Volkswagen, Audi admit to cheating pollution tests in the US
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