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On my 2002 Ford F150 5.4l V8 Tritan 4x4 the service engine soon light came on and I pulled out my obdII tool and ran it came up with code #PO171 bank 1 to lean and bank 2 to lean? what do I need to do to fix the problems ad what are they?

Vehicle: 2002 ford f150 5.4 v8 4x4

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P0171 Fuel trim lean Bank 1

Vacuum leak are the main causes for a lean condition broken or disconnected vacuum hoses should be look for, this includes the PCV hose the brake booster hose and intake manifold also,

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