Volkswagen’s attempts to cheat the Clean Air Act in the US have proved shocking to diesel drivers thinking they were helping save the planet, but things are going to get even more complicated. The news that independent testing had spotted nitrogen oxide levels as much as 35x higher than the Environmental Protection Agency (EPA) permits from select VW and Audi cars, and that the discrepancy came down to some testing trickery, has left the German behemoth in hot water.
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https://www.slashgear.com/volkswagen-got-caught-emissions-cheating-what-you-need-to-know-21405669/