Matthias Mueller, new chief executive of Volkswagen AG, attends a news conference at the VW factory in in Wolfsburg, Germany, on Friday. Mueller takes over after Martin Winterkorn resigned earlier this week amid a diesel emissions-testing scandal.

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Former Volkswagen Chief Executive Martin Winterkorn has stepped down as chairman of luxury brand Audi amid an investigation of two emissions scandals that occurred during his reign at Europe’s largest carmaker.

Winterkorn quit his post at Audi on Wednesday, a spokesman at the Ingolstadt-based carmaker said on Thursday, after resigning as chief executive of family-owned Porsche SE , VW’s majority stakeholder, last month.

The 68-year-old Winterkorn was forced to resign as VW group chief executive by the carmaker’s influential labor leaders and the state of Lower Saxony, VW’s No. 2 shareholder, on Sept. 23, five days after the company’s rigging of diesel emissions tests became public in the United States.

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