(Bloomberg) — The U.S. Environmental Protection Agency is investigating a second emissions-control software program on Volkswagen AG cars that were rigged to pass pollution tests, one that the automaker may have failed to properly disclose.

The program is part of the so-called EA 189 diesel engines used since 2009 that are also fitted with software that the automaker has admitted was designed to fool emissions tests, according to a person familiar with the matter who asked not to be named because the information is private.

"VW did very recently provide EPA with very preliminary information on an auxiliary emissions control device that VW said was included in one or more model years," EPA spokesman Nick Conger said. The agency, as well as its California counterpart, "are investigating the nature and purpose of this recently identified device."

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