WASHINGTON — Volkswagen’s emissions cheating scandal widened Friday after the U.S. Environmental Protection Agency said the German automaker used software to cheat on pollution tests on more six-cylinder diesel vehicles than originally thought.

Volkswagen told the EPA and the California Air Resources Board the software is on about 85,000 Volkswagen, Audi and Porsche vehicles with 3-liter engines going back to the 2009 model year. Earlier this month, the regulators accused VW of installing the so-called “defeat device” software on about 10,000 cars from the 2014 through 2016 model years, in violation of the Clean Air Act.

The regulators said they will investigate and take appropriate action on the software, which they claim allowed the six-cylinder diesels to emit fewer pollutants during tests than in real-world driving.

The latest allegation means that more Volkswagen, Audi and Porsche owners could face recalls of their cars to fix the software, and VW could face steeper fines and more intense scrutiny from U.S. regulators and lawmakers.

Audi spokesman Brad Stertz on Friday conceded that VW never told regulators about the software, in violation of U.S. law. He said the company agreed with the agencies to reprogram it “so that the regulators see it, understand it and approve it and feel comfortable with the way it’s performing.”

The software is on Audi Q7 and Volkswagen Touareg SUVs from the 2009 through 2016 model years, as well as the Porsche Cayenne from 2013 to 2016. Also covered are Audi A6, A7, A8, and Q5s from the 2014 to 2016 model years, according to the EPA.

Stertz said the software is legal in Europe and it’s not the same as a device that enabled four-cylinder VW diesel engines to deliberately cheat on emissions tests. VW has told dealers not to sell any of the models until the software is fixed.

VW made the disclosure on a day it was meeting with the agencies about how it plans to fix 482,000 four-cylinder diesel cars equipped with emissions-cheating software.

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