Fixing the code P0171 (O2 sensor but idk which one)

Are you sure it's the O2 sensor, not an intake leak after the MAF sensor or vacuum leak? P0171 – System Too Lean (Bank 1)
IMHO: pay a shop to do it - don't buy the part. Their part n their labor = their problem if that code comes back. It's called a warranty.

If your going to do it yourself; it's located on the exhaust manifold. Most parts store will loan you the correct tool/socket to change it. Match up the stamped part numbers old vs new. Putting in the wrong sensor will trip other codes pointing you in the wrong direction.

Good Luck......

 

Have you checked everything correctly according to this procedure?
https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/2054m/cip0171.pdf

 

Correction for compliance with the specified parameters consists of the sensor checking the exhaust from the engine and telling it to add more fuel, or vice versa, reduce the fuel, otherwise the mixture is incorrect.
The sensor can make mistakes when it is faulty.
But other systems that do not work correctly and transmit their parameters for the primary formation of air and fuel volumes can also make mistakes.
Then the sensor only informs that everything is wrong, correct it.

Trouble Area:
Air induction system
Injector blockage
Mass air flow meter
Engine coolant temperature sensor
Fuel pressure
Gas leakage in exhaust system
Open or short in A/F sensor (bank 1, sensor 1) circuit
A/F sensor (bank 1, sensor 1)
A/F sensor heater (bank 1, sensor 1)
EFI M relay
PCV valve and hose
PCV hose connection
ECM

 

With a reading like that I don't know if I'd rule out wiring.