It is the latest twist in "Dieselgate."
Another tightening of EPA standards this year could trip up automakers.
It’s the greatest known scandal in automotive history, but less than a year later Volkswagen’s sales are humming.
In late 2015, Volkswagen admitted to installing the software in more than 11 million cars globally.
The German car maker has still not decided what to offer vehicle owners after emissions scandal.
Renault is not alone in exceeding emissions levels, France's Energy Minister Segolene Royal said.
Relations between the two sides remain strained four months after the cheating came to light.
Fixing old diesel cars is a waste of time and money, the letter reads. Make clean cars instead.
The company disclosed the news in a meeting with the EPA on Thursday.
A new study from MIT found that the excess pollution will kill about 60 Americans prematurely.
The Volkswagen AG scandal over diesel emission tests is headed for Hollywood.
Diesel Cars Made by Mercedes-Benz, Honda, Mazda and Mitsubishi Also Pollute More Than Emissions, Tests Revealed
Honda's models spew as much as six times the amount of NOx that was originally reported.
Michael Horn, head of Volkswagen Americas, testified before a House of Representatives panel on Thursday.
House panel hears testimony from Volkswagen's head of U.S. operations.
Since the VW scandal, European authorities have blamed each other for a lack of action.