2013 Kia Sportage 2.0T P2297 Code. Possible leak?

[TheReal_DW]

CEL came on the other day P2297 along with a history p0140 code which ended up going away later. Fuel trims have been 8-15% total when cold and lessen after a long drive. My injectors are clean as I’ve run about 4 bottles of Techron and two Valvoline Restore and Protect fuel cleaners. There’s also a cabin smell when flooring it onto the highway for the first time. I don’t feel any cracks physically with my hand. If it is cracked can it be welded closed? The manifold and turbo are one piece

 

[Marcozi]

The "P" code sez that the bank 1 pre-cat oxygen sensor is out of range when the car is decelerating. I'm wondering which way it's "out of range." I have a suspicion that it's running lean.