[Jopldangla]

Turns out.... this guy had the same noise and fixed it by replacing the oil trap.

https://www.swedespeed.com/threads/2016-xc90-oil-catch-pcv-easy-fix.640578/

 

[Jopldangla]

I just bought a Volvo OEM off of ebay (brandy new) for $90. I didn't want to play around with aftermarket stuff, and liked the idea of saving $100 over our favorite online stores... fingers crosses..
Would a bad oil trap be a cause for higher than usual oil consumption?

 

[Jopldangla]

It’s an early 2016. .

 

[Jopldangla]

I replaced the oil trap. Whining noise is gone. Yay. Noticed that the hose connected to the oil trap had a small crack in a spot where it shouldn’t effect the seal to the oil trap, but I will replace this hose too.
I still have the P0171 code (reset it using Obd scanner tool).
think it could be the hose? Should I move on to replacing MAF? Or O2 sensors (not super cheap).

 

[Jopldangla]

I took the car for a nice 1hour drive, used the scanner to reset the DTC and it hasn’t come back yet. So I think it may be resolved now.
Thanks for the feedback on a regular scanner tool (I use a veepeak with the “Car Scanner” app for iPhone).