Volkswagen chief faces grilling by board over diesel scandal

Volkswagen Chief Executive Martin Winterkorn faced a reckoning with his board on Wednesday, summoned to explain the falsification of U.S. emissions tests in the biggest scandal in the 78-year history of the world's largest carmaker. Volkswagen is under huge pressure to act, with its shares down more than a third in value since the crisis broke, and the bad news still coming. German prosecutors said on Wednesday they were conducting a preliminary investigation into the manipulation of vehicle emi