SAN FRANCISCO (CBS/AP) — Volkswagen is temporarily halting sales of more diesel vehicles in the U.S. and Canada after regulators said they cheated on emissions tests.

The action covers vehicles with 3.0-liter V6 diesel engines, including the 2013 Audi Q7, the 2014-2015 Audi A6, A7, A8, Q5 and Q7 and the 2013-2016 Volkswagen Touareg. Porsche has also halted sales of its 2014-2016 diesel Cayenne SUV.

READ MORE: Ceres Man Pleads Guilty To Operating International Cockfighting Breeding Farm

An Audi spokesman said the company is still determining how many vehicles are involved.

READ MORE: King Tides: Coastal Flood Advisory Issued For San Francisco Bay Shoreline This Weekend

The U.S. Environmental Protection Agency said Monday that new testing showed VW’s V6 diesel engines had software that allowed them to rig emissions tests, just like the company’s smaller four-cylinder engines.

But Volkswagen says the V6 diesels had a different emissions control system. It’s meeting with the EPA to better understand the new test results.

MORE NEWS: Smash-And-Grab Thieves Hit San Jose Eastridge Mall Jewelry Store; 5 Sought

© Copyright 2015 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.