VW shares, which have bounced back from unprecedented losses at the start of the week, hit an intraday high of 117 euros in the first few minutes of trading, an increase of 4.3 per cent on the day.
But by late morning, they had fallen back to show a more modest gain of 1.78 per cent, as it quickly became clear that the carmaker's woes were far from over.
France announced sample checks on diesel cars as soon as next week, after the European Union urged its 28 member states to investigate whether vehicles in their countries comply with European pollution rules.
French Environment Minister Segolene Royal told Europe 1 radio that the random checks of 100 diesel cars aimed to "ensure the absence of fraud".
Volkswagen was expected to name its new CEO later in the day to replace Martin Winterkorn who quit at the height of the biggest crisis engulfing the group.
Volkswagen's 20-member supervisory board was scheduled to meet at their headquarters in Wolfsburg to designate the new leader.
But according to reports, they have already picked the current chief of VW's luxury sportscar division, Porsche, 62-year-old Matthias Mueller.
Regulators from the EPA and the California Air Resources Board accused Volkswagen of designing software to evade US limits on nitrogen oxide and other pollutants that engaged pollution controls only when cars are undergoing emissions tests.
The scale of VW's deception became clear when the company admitted that 11 million of its diesel cars are equipped with the devices.
"We take these allegations, and their potential implications for public health and air pollution in the United States, very seriously," a department spokesman said.
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