The importance of on-road emissions testing was highlighted last week when the United States Environmental Protection Agency (EPA), the California Air Resources Board and Environment Canada discovered illegal software in some Volkswagen, Audi and Porsche diesel cars with 3.0-liter V6 engines encompassing model years 2014 through 2016.

Audi and Porsche are the premium brands of Volkswagen, which disputed the findings and pledged to cooperate with the EPA “to clarify the matter in its entirety.”

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