DETROIT (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.

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

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.