The U.S. Environmental Protection Agency revealed in a press conference Monday that Volkswagen installed the software it used to cheat on emission tests in some Audi and Porsche SUVs, according to USA Today.

The organization asserts that the German automaker not only installed the cheating software in its VW cars, but also in 3.0-liter V-6 TDI diesel engines used by Audi, Porsche and VW, Green Car Reports noted.

Among the vehicles that were given the disel-defeat engine software were the 2014 Volkswagen Touareg TDI, the 2015 Porsche Cayenne Diesel, and five 2016 Audi models: The A6, A8, and A8L TDI sedans; the A7 TDI hatchback; and the Q5 TDI sport utility vehicle.

The California Air Resources Board said at the press conference that an estimated 10,000 luxury diesel SUVS made by Volkswagen from 2014 through 2016 are affected, WRAL reported.

The automaker designed the engine software to defeat emissions tests. The "cheat code" allowed the vehicles to emit up to nine times the allowed amount of nitrogen oxide pollution into the air while driving on the road.

Volkswagen faces fines of up to $37,500 for each vehicle in violation of the EPA standards, WRAL noted. This could mean up to $375 million in penalties in addition to the $7.38 billion VW set aside to pay for recalling and fixing the affected vehicles in the future.

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