1998 ford tarus

1998 taurus 3.ol 24 valves has code dtcpo171 system to lean bank 1 how do i go about fixing tx ted

According to the service manual, the following items can cause this code:
For lean and rich DTCs:
-Fuel system excessive fuel pressure.
-Leaking/contaminated fuel injectors.
-Leaking fuel pressure regulator.
-Low fuel pressure or running out of fuel.
-Vapor recovery system.
-Induction system:
-Air leaks after the MAF.
-Vacuum Leaks.
-PCV system.
-Improperly seated engine oil dipstick.
-EGR system:
-Leaking gasket.
-Stuck EGR valve.
-Leaking diaphragm or EVR.
-Base Engine:
-Oil overfill.
-Cam timing.
-Cylinder compression.
-Exhaust leaks before or near the HO2Ss