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How to diagnose P0191 on 2006 Ford Explorer-4.6 V8

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Engine bogs momentarily , particularly during upshifts.
Vehicle: 2006 Ford Explorer 4.6 V8

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P0191 Fuel rail pressure sensor  A circuit range performance

This code condition you measure the fuel pressure , the specification for the fuel pressure should be 30 - 40 psi either key on engine off or engine running.

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