Regulators approve updates to some Audi, VW, Porsche 3.0-liter diesel SUVs

2015 Audi Q7 TDIState and federal environmental regulators announced Monday they had approved modifications to illegally polluting Volkswagen, Audi, and Porsche SUVs fitted with VW Group's 3.0-liter V-6 TDI turbodiesel engine The EPA and California Air Resources Board sent a letter Friday to VW announcing the approved modifications for the 3.0-liter TDI models...