Following a massive emissions scandal involving Germany's Volkswagen, independent French experts found dangerously high levels of emissions from diesel engines of several carmakers, including Renault.
Prosecutors have ordered a probe be opened into "cheating on key parts (of vehicles)" and into the quality of the tests carried out.
Renault shares were trading 2.4 per cent lower at 84.16 euros around 1110 GMT, having opened over one percent higher. They slumped by over four percent in an initial reaction to the news.
The Italian-American company immediately denied the charges and pledged to work with President-elect Donald Trump's adminstration to resolve the issue "fairly."
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The shockwaves from Volkswagen's own emissions scandal are still reverberating around the global auto industry.
US officials said Wednesday the German giant will plead guilty to three criminal charges and pay a total of $4.3 billion in fines to settle the emissions cheating scandal known as "dieselgate".
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