The National Highway Traffic Safety Administration [NHTSA] has upgraded an ongoing investigation into the Volkswagen Passat with 4-cylinder turbo powerplants over reports of engine fires to include all sedans from the 2001-2007 model years and Wagons from the 2006-2007 model years. Last summer, the government agency had opened a preliminary examination into the 2002-2003 model year Passat amid concerns on fires caused by failing ignition coils. The upgraded investigation now covers some 490,000 VW Passats. Read more »