Mini Roadster CEL and Power Loss

Smoke when accelerating sounds familiar. I had something similar with my Mini. Check engine light was on too. Was it the ventilation?

So it was indeed the crankcase ventilation valve causing the smoke? Any other symptoms you recall?

Yep ventilation valve. Mine was leaking. Best get it checked at a workshop.

Confirmed crankcase ventilation valve failure. Parts and labor set me back 360€. Thanks for the insight.