U.S. authorities have found three unapproved software programs in 3.0 liter diesel engines made by Volkswagen's Audi unit, German weekly Bild am Sonntag reported, without saying where it had obtained the information.The software allowed the turbocharged direct injection (TDI) engines used in Audi's Q7, Porsche's Cayenne and VW's Touareg models to shut down emissions control systems after about 22 minutes, the paper said. Official methods to measure emissions usually last about 20 minutes, it added.
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