Renault has been implicated in the emissions scandal by the German environmental group Deutsche Umwelthilfe (DUH).
In a study conducted by the University of Applied Sciences in Bern, Switzerland, and commisioned by DUH, Renault's Espace minivan was found to be releasing up to 2.06 grams of Nitrous Oxide per kilometre from its 1.6-litre engine. That figure is 25 times over legal limits. The vehicle met the statutory 80 milligramme cap only with a cold engine after "specific pre-conditioning".
In a statement, Renault said it contested the findings of the DUH lobby group.
The emissions scandal was exposed to the world in September when enviromental regulators in the United States caught Volkswagen using cheating software in its cars to cheat emission tests.