Volkswagen Acknowledges V6 Diesel Engine Also Cheated

Jason Siu
by Jason Siu

Volkswagen has confirmed that its 3.0-liter turbocharged diesel V6 engine also cheated on EPA diesel emissions tests.

The engine is used in various Audi, Porsche and Volkswagen models including the Cayenne SUV which is currently under a stop-sale order. Originally Volkswagen denied the charges by the EPA, but the German automaker has now told regulators that 75,000 vehicles using the 3.0-liter turbo-diesel V6 engine are improperly fitted with auxiliary emissions controls. This is in addition to the 482,000 vehicles equipped with the Volkswagen Group’s 2.0-liter diesel four-cylinder engine that were outed by the EPA in September.

SEE ALSO: VW Identifies 430K New Cars with Incorrect CO2 Ratings

It’s worth noting that automakers are allowed to use auxiliary emissions controls so long as they are revealed and detailed during the testing process. Volkswagen however, did not reveal the use of such auxiliary emissions controls and failed to properly notify regulators. Although how the auxiliary emissions controls function hasn’t been detailed, it is believed that the technology is designed to warm parts of the exhaust system to reduce emissions, since components like the catalytic converter perform better when warm.

It is still unclear how Volkswagen plans on fixing all the affected diesel engines.

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Jason Siu
Jason Siu

Jason Siu began his career in automotive journalism in 2003 with Modified Magazine, a property previously held by VerticalScope. As the West Coast Editor, he played a pivotal role while also extending his expertise to Modified Luxury & Exotics and Modified Mustangs. Beyond his editorial work, Jason authored two notable Cartech books. His tenure at saw him immersed in the daily news cycle, yet his passion for hands-on evaluation led him to focus on testing and product reviews, offering well-rounded recommendations to AutoGuide readers. Currently, as the Content Director for VerticalScope, Jason spearheads the content strategy for an array of online publications, a role that has him at the helm of ensuring quality and consistency across the board.

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