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I'm try to trouble shoot the problem on my own. Code is po191. Where are each sensor located and would a do it your self er be able to complete the task?

Vehicle: 2007 ford f150 5 . 4 triton Xlt

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P0191 Fuel rail pressure (FRP)  sensor "A" circuit Range / Perfromance

Some of the causes for this code are low fuel, low fuel pressure, vacuum leaks affecting perfromance. or the Fuel rail pressure sensor itself. If this was code P0193 you would just replace the fuel rail pressure sensor. The definition of this code should be "something affecting the fuel pressure" There are occasion where the fuel rail pressure sensor was the problem, and being a popular Ford problem the FRP this may just be the case.  This is a FRP sensor which is mounted on the fuel injector rail. which will be similar to what you will be inspecting, This is a task if you where to replace the sensor will be easy.

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