U.S. officials have discovered three new unapproved software programs that allows cheating of pollution controls on Volkswagen’s 3.0-liter diesel engines made by Audi Reuters is reporting.

The news originated from German news weekly Bild am Sonntag, which did not reveal its source for the information.

The engine is made by Volkswagen Group’s Audi division and is used in the Audi Q7, Porsche Cayenne and VW Touareg SUVs.

The software allows the turbocharged direct-injection engine to shut down its emissions control systems after about 22 minutes of driving, allowing the vehicles to pass government emissions tests.

Typically, government emissions tests last for around 20 minutes.

This is in addition to previously-disclosed software used on the 3.0-liter diesel engine, which VW admitted was used to make affected vehicles pass government emissions tests, but shut down the emissions controls in real-world driving.

SEE ALSO: VW Reportedly To Buy Back 500,000 Diesel Cars Equipped With Cheat Software

Volkswagen has admitted it had thwarted U.S. diesel emissions tests for years and agreed to fix or buy back vehicles from consumers and provide funding that could benefit cleaner technologies.

The settlement covered 2.0-liter diesel engines and could cost up to $15.3 billion.

However, that settlement does not include an estimated 85,000 vehicles with the larger 3.0-liter diesel and an agreement for penalties is still months away.

Audi managers are scheduled to appear at a hearing in front of U.S. environmental authorities on Aug. 10, Bild am Sonntag said, adding the carmaker was bracing for a substantial penalty payment.