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P0191 Diagnostic Trouble Code Discussion for July 2007

Fuel Rail Pressure Sensor Performance

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Trouble Ticket Help Requests for DTC P0191
Help Request Posted
2004 Ford E-350 Super Duty 5.4L MIL Lamp on VIN: 1FDWE35L44
P0191: Fuel rail pressure sensor curcuit. ... two with the highest miles (100,000+) have this recurring P0191 code. They both set the code after extended idling, and the coolant temp is hot (over 212 degrees). These things idle with the A/C cranked up on the front and rear auxiliary units for God know...
July 10, 2007