The former boss of German carmaker Volkswagen denied all charges relating to the diesel emissions scandal on the second day of his high-profile trial in the northern city of Braunschweig. Formerly known as “Mr. Volkswagen,” Martin Winterkorn faces fraud and other charges linked to the scheme by Volkswagen to use software to deceive environmental regulators in the United States over emissions from the company’s diesel engines. “The public prosecutor’s accusation that I failed to take action that was required of me in my role as [chief executive], deceived and harmed customers and shareholders, …