XC40 Diesel Engine Smoke and Power Loss

Sounds familiar! I had something similar happen on my XC40. The symptoms were nearly identical – light, power loss, the whole shebang. I remember thinking it was the turbo at first, but that was ok. Have you checked for any unusual whistling noises? How's the oil consumption?

Good shout about the whistling! I haven't noticed anything obvious, but I'll listen out on my next drive. Oil consumption seems normal, not excessively high or low. Was your issue definitely the crankcase ventilation valve, or something else entirely? Any other clues I should be looking for before I tear into it?

Yeah, in my case it turned out to be a faulty crankcase ventilation valve. I'd suggest getting it checked out by a workshop. They'll be able to diagnose it properly and confirm if that's the culprit. Cost me around 360€ to get sorted, all in.

Thanks a bunch for the insight! I appreciate the confirmation that I'm not completely barking up the wrong tree. I'll book it in with the workshop and get them to run a diagnostic. Hopefully, it's just the valve and nothing more serious. They changed the valve, cleaned all oil residue and the car runs like new. Cheers!