Grandland X Crankcase Ventilation Issue

Sounds like a crankcase ventilation issue. My old Volvo had similar symptoms - check engine light, rough idling. If it's the valve, you might even hear hissing. Is your fuel consumption higher?

Thanks. I have seen a slight increase in fuel consumption, but nothing dramatic. What specific issues did you face with your Volvo, and how did you diagnose the crankcase ventilation valve?

Okay, slight fuel increase points more towards that valve. Unmetered air was leaking into the intake manifold, messing with the fuel/air mixture. I got a fault code mentioning the PCV system. Given your symptoms, mileage, and fuel consumption, get it checked by a professional. Could be other things, but it sounds like a crankcase ventilation problem. Don't ignore the smoke!

Thanks for confirming my suspicions. I'll book a mechanic to inspect and replace the crankcase ventilation valve, if needed. The repair ended up costing 360€.