Drives great to rough idle and no power loss. It’s like the light Is not on. Popped up when I was in the highway, I think o2 some people say upper intake gaskets manifold.
Bank 2 system to lean check the vacuum lines didn’t see anything cleaned maf and throttle body intake, thank!

 

Welcome to the forum

P0174 System too Lean (Bank 2)

Yes, at 170k miles you should be on 2nd set of O2 sensors, if you are not sure or don't know, change them
O2 sensors use a chemical reaction to detect Oxygen in the exhaust, they generate their own voltage, as chemicals run out voltage goes down and that causes Lean Codes
O2s are the only sensors that wear out in a specific time or mile schedule, 12 years or 100k miles, after that they are on the downward path

Check spark plugs on Drivers side of engine(bank 2), see what the tips tell you about each cylinder
Misfires cause Lean codes, no Oxygen is burned up when a cylinder misfires, so O2 "sees" too much oxygen on that bank of the engine