Renault is recalling 15 000 vehicles before they go on sale to check their engines after they failed official tests.
Renault has promised to come up with a "technical plan" to bring down harmful emissions of its vehicles.
No sign of cheat devices as Renault facilities raided, but emissions limits appear to have been exceeded.
New emissions controversy after a Swiss university measured a Renault's emissions at 25 times the Euro 6 limit.
Environmental lobby group says nitrogen oxide emissions of Renault 1.6 dCi Espace 25 times higher than Euro-6 limit.