The California Air Resources Board yesterday said it had notified Volkswagen Group of America to recall all VW, Audi and Porsche vehicles equipped with 3.0-liter diesel engines in the model years 2009-2015 that were sold in California.

The company has 45 business days to submit its plan to begin the process of recalling and repairing the illegal emissions software, said CARB, part of the California Environmental Protection Agency. The western state has some of the toughest environmental regulations in the United States.

"This action is the result of an admission by officials at Audi A.G., manufacturer of all the engines involved, that the vehicles contain three auxiliary emissions control devices," CARB said in a statement on its website.

The recall will involve between 15,000 and 16,000 3.0-liter diesel vehicles, said Dave Clegern, a CARB spokesman. In its letter to Volkswagen, the agency noted that though the 3.0 liter engine was developed by Audi, it has been used by VW and Porsche in their Touareg and Porsche models since 2009.

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