Audi, Mercedes now updating European diesels for emissions; more to come?

2013 Audi TDI rangeBoth Mercedes-Benz parent Daimler and Volkswagen Group have approved new plans to retrofit older diesel-powered vehicles with new software at no cost to owners. The largest number of such cars will be in Europe. The news comes amid the latest allegations surrounding German automakers and their brands' diesel cars—and more updates could be on...