XC90 Diesel Engine Power Loss and Smoke

Hey, those symptoms do sound worrying! A faulty crankcase ventilation valve can cause all sorts of issues. Have you noticed any unusual idle? Maybe a whistling sound or a rough running engine at a standstill? Also, have you checked for any obvious signs of oil leaks around the engine?

Thank you for your reply. Regarding your questions, the idle does seem slightly rougher than usual, although there is no whistling sound. I have not yet thoroughly inspected for oil leaks. If it is indeed the crankcase ventilation valve, how critical is its immediate replacement? What could happen if I delay the maintenance?

If the idle is rough, and you're seeing smoke, driving with a bad crankcase valve can lead to serious engine damage over time. Think blown seals, oil leaks everywhere, and potentially a seized engine. It's best to get it checked by a workshop ASAP. They can confirm the issue and give you a proper quote for repair.

I appreciate the advice. Based on the information provided, I will schedule an appointment with a qualified mechanic to assess the crankcase ventilation system. I had it diagnosed, and the crankcase ventilation was indeed defective, and the eventual repair cost amounted to 360€. Thank you again for your assistance.