US regulators have begun an investigation into another computer program in Volkswagen's diesel cars that also affects the operation of the cars' emission controls.

Federal and California regulators have begun an investigation into a second computer program in Volkswagen’s diesel cars that also affects the operation of the cars’ emission controls.

VW's emissions cheat was inexcusable. For people who buy diesel cars and overlook the clattering engine and weird yellow fuel pump at the gas station, they like to think that their good gas ...