2015.5 S60 T5 2.0 turbo. Have P0171 code for the second time. It cleared once on its own. I reset yesterday, but it quickly comes back. Bought the Volvo executive-owned car with 4000 miles in November 2014. Now has 15,000 miles. Any suggestions, please, or should I just wait for it to go away and have it checked at the 20,000 mile dealer service? Not driving the car much, so it may be a while. Thanks

 

the code is saying your car has a lean condition. most likely cause is a vacuum leak or a crack in an intake tube. Considering you are under warranty, I'd take it in for service (provided you get a loaner car).