Citroen Nemo crankcase ventilation issue

I had something similar with my Nemo. Was the idle also rough?

Yes, the idle is somewhat erratic. Could you tell me about your experience and what caused it in your case?

Mine was a defective crankcase ventilation valve too. I'd advise getting a professional diagnosis at a workshop.

Thank you. I took the car to a mechanic, and it was the crankcase ventilation valve, just as you thought. Repair cost was 360€. All fixed!