EPA details how VW software thwarted emission tests

CIO:  The software used by Volkswagen to get around environmental standards in some 11 million vehicles effectively told each car to go into a "clean mode" when it detected the car was being tested for emissions.

Details about how the automaker was able to elude emissions testing -- the "defeat device," as the software has been called -- is included in a Sept. 18 letter from the Environment Protection Agency (EPA) to Volkswagen.

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