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Check engine light code 174 lean bank 2. Was told it was intake plenum gasket on 2004 Ford Taurus

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Have a check engine code 174 engine lean in bank 2. was told to replace intake plenum gasket. I did, and throttle positioning sensor,imur gasket, idle control valve cleaned, mas airflow sensor cleaned.
Why do I still have this code. Could it be a bad o2 sensor? Oh I also checked all vacuum lines for leaks.
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3.0 DOHC V6. Did you replace the INTAKE gaskets? If not that may be the problem. Could have it tested.
Good luck with it.
OHV V6 I replaced the upper plenum gasket because the engine was running pretty rough at idle and I was getting the code so I was told to replace the upper intake plenum gasket so I did. I even replace the runner control gasket, cleaned mas airflow sensor, cleaned ide air control valve, and checked for vacuum leaks on all hoses and never found any leaks. Since I replaced the upper plenum gasket the car does run alot smoother but the code came back. When I say came back, I disconnected the battery to remove the plenum since I had to unplug all the electrical components that were connected to the upper plenum.