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French prosecutors have opened a formal investigation into suspected diesel emissions test cheating by PSA, the maker of Peugeot and Citroen cars.

The inquiry was opened on April 7th, according to the prosecutor’s office.

This comes two months after PSA, which is in the process of buying German group Opel, became the fourth carmaker to be referred to the French prosecutors by France’s consumer fraud watchdog.

It is part of a sprawling investigation into emissions-test cheating by carmakers in France, set up in the wake of the Volkswagen emissions scandal.

The French government in 2015 set up a national commission to test emissions from vehicles sold by various carmakers in France to see if any cars were capable of cheating during official tests.

PSA on Monday denied wrongdoing and said that it complies with all laws in the countries where it operates.

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