(Bloomberg) — Volkswagen AG's diesel-emission scandal just got a little bigger.

The U.S. Environmental Protection Agency said Friday that the investigation now includes every Volkswagen and Audi model with a larger 3.0-liter diesel engine from model years 2009 through 2016.

Previously, the EPA was investigating only a few of the larger-engine models from VW, Audi and Porsche from 2014-2016, along with 482,000 vehicles with 2-liter diesel engines from the 2009-2015 model years.

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