U.S. regulators approve fix for 326,000 VW diesels

By David ShepardsonWASHINGTON (Reuters) - The U.S. Environmental Protection Agency and California Air Resources Board on Thursday approved a fix for 326,000Volkswagen AG diesel cars, the agencies and the automaker said Thursday.The fix will include hardware and software upgrades, including replacing an emissions catalyst but will reduce vehicle fuel economy ratings by as much as 2 miles per gallon.The world's largest automaker will still need to obtainapproval for a resale plan for the 2009-2014