Take this story with a fair amount of salt as the outlet who broke this story doesn't say where it got this information.
According to a report from German newspaper Bild am Sonntag, U.S. authorities have uncovered three more pieces of illegal software in the 3.0L TDI V6 used on the Volkswagen Touareg, Audi Q7, and Porsche Cayenne. The various pieces of software can turn off the emissions control systems after 22 minutes of driving. This would allow a vehicle to pass an emissions test (which lasts about 20 minutes).
The use of this type of software is common in vehicles sold in Europe thanks to a loophole in European Union laws. This came to light back in May as the German Government asked Opel for more information on software used on the Zafira diesel that would turn off the emission controls.
Bild goes on to say that U.S. authorities have set up a meeting with Audi officials this week to discuss this. Not surprisingly, Audi and the EPA declined to comment.