Peter Warman
This is why it was undetected for so long in the USA, the state that has the highest emission standards in the world only has a visual test for diesels, no particulate tailpipe testing, no Dyno, no NOx test, Is the MIL on or off (pretty scientific) 
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VW Diesel Vehicles # - Peter Warman September 22, 2015, 8:08 am
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