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EPA says more VW, Audi and Porsche diesel models violate emissions rules

In a new filing today, the Environmental Protection Agency notified Volkswagen that it found software designed to defeat emissions testing in seven models using a 3-liter diesel engine.

2014 Audi A7 TDI
The hatchback allows for 24.5 cubic feet of luggage space.
Josh Miller/CNET

The one silver lining Volkswagen could point out during the revelations that it had cheated on its diesel emissions testing was that its larger 3-liter V-6 TDI engines were unaffected, but that lining tarnished this morning as the EPA issued a notice that it had found a similar device for evading emissions testing in V-6 TDI vehicles from the Volkswagen, Audi and Porsche brands.

In September, Volkswagen admitted to rigging its emissions testing, engaging a different engine program when its vehicles were hooked up to testing equipment than when they were driven normally on the road. Estimates suggest that emissions on the road could have been 40 times worse than in the testing environment. The initial EPA investigation and Volkswagen's own admission found that vehicles with its 2-liter four-cylinder TDI engine were in violation of EPA rules.

A new notice posted this morning on the EPA's website and sent to Volkswagen includes vehicles using the larger 3-liter V-6 TDI engine. The notice lists those vehicles as the "VW Touareg," "Porsche Cayenne," "Audi A6 Quattro, A7 Quattro, A8, A8L, and Q5."

When contacted for comment, Volkswagen sent a prepared statement saying that the EPA notification referred to a software function in the cars that had not been adequately described in the original application for emissions certification. Volkswagen noted that "no software has been installed in the 3-liter V6 diesel power units to alter emissions characteristics in a forbidden manner."

Volkswagen's statement said that it will cooperate fully with the EPA in response to the notice.

Editors' note: This story has been updated to reflect a revised statement from Volkswagen in response to the EPA notification.