(Bloomberg) -- Volkswagen AG rejected U.S. EnvironmentalProtection Agency allegations that its cheating on diesel-emissionstests included Porsche and other high-end vehicles, setting up ashowdown with U.S. regulators as it seeks to repair its batteredimage.

Software in 3.0-liter diesel engines was not installed “in aforbidden manner,” and Volkswagen is cooperating with the EPA to“clarify” its questions, the Wolfsburg, Germany-based company saidin a statement. VW’s shares fell 1.5%, taking the market value lostsince the diesel-testing scandal emerged in September to 19.9billion euros ($21.8 billion).

The new investigation centers on the Porsche Cayenne and VWTouareg sport utility vehicles and as well as larger sedans and theQ5 SUV from Audi, according to the EPA. Volkswagen had previouslyadmitted to installing a so-called defeat device in smaller autosfrom the 2009 to 2015 model years.

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