3.0 Gasoline 2 codes P0171-Fuel trim Bank one condition and P0174- Fuel trim Bank two condition. What and how to fix the problem?

Check your engine lights on. I tried lucas injector cleaner, put about 3 small bottles, did not work but everytime I add a bottle of STP gas treatment with each full tank, the check your engine light goes away and come back when I fill my tank with gas without adding STP gas treatment. A friend who's a mechanic helping me and run diagnostic and said O2 sensor X 4 working. I am planning to replace the fuel filter any idea or comment.