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Ford OBD-II Diagnostic Code PO 191

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#1 hodo58



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Posted 24 August 2013 - 03:45 PM

2005 Ford V-10 E-450 Chassis.  I routinely get the Code PO 191 when acceleration to highway speed after a brief engine turn-off.  The code indicates "Fuel  Pressure Sensor Circuit Performance".  The engine has no driveability issues.  All service items are current.  Scanning guage clears the code.

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#2 DickandLois


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Posted 24 August 2013 - 05:02 PM



Welcome to FMCA !


Possible causes:


-High fuel pressure
- Low fuel pressure
- Damaged FRP sensor
- Excessive resistance in the circuit
- Low or no fuel
- Wiring harness connector of the fuel pressure sensor
- Fuel Rail Pressure Sensor
- Vacuum leaks
- Fuel


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