Where is the fuel regulator on a2006 ford expedition

https://www.yourmechanic.com/article/p0191-obd-ii-trouble-code-fuel-rail-pressure-sensor-circuit-range-performance-by-jamahl-walker

Anon, Trouble code P0191, You may need a good tech. with scan tool to read and test system.

• Fuel Rail Pressure Sensor Circuit Range/Performance,computer see's signal from the Fuel Rail Pressure Sensor and/or its circuit is sending erratic readings, indicating a fuel pressure condition that is abnormal. Problems could be out of gas, leaking fuel, faulty fuel pressure sensor, bad wire or plug in circuit,fuel pressure regulator, the fuel pump could be faulty also. Check the attached links,instruction and guides, Good luck
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P0191 OBD II Trouble Code

P0191 Fuel Rail Pressure Sensor Circuit Range Performance

RAV4 2001 Trouble Code p0191 probable solution Toyota Nation Forum Toyota...

code P0191 2007 Toyota Google Search

first change gaz filter...
Replace fps(fuel pressure sensor)

Possible causes
- Low or no fuel
- High fuel pressure
- Low fuel pressure
- Faulty Rail Pressure (FRP) Sensor
- FRP harness is open or shorted
- FRP circuit poor electrical connection
- Faulty Fuel Pump
- Vacuum leaks
P0191 Ford - Fuel Rail Pressure Sensor Circuit Range/Performance P0191 Ford Description
The Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge device in which resistance changes with pressure. The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signal to the Powertrain Control Module (PCM) corresponding to pressure.
Strain gauge type sensors are consider passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.
Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.

not knowing what kind of car you have probably a ford fuel rail pressure is low culprits could be fuel filter; fuel pump fuel pressure regulator or even a faulty sensor i would start with the fuel filter

2004 Ford 150 5 4L Stall No Start P0191 Fuel Rail Psi Sensor P1233 Fuel...

That is P0191 not o.
P0191 FORD - Fuel Rail Pressure Sensor Circuit Range/Performance

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
-

P0191 FORD - Fuel Rail Pressure Sensor Circuit Range/Performancehttp://engine-codes.com/p0191_ford.htmlForum CodePossible 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
- Fuel
- Vacuum leaks

replace fuel pressure regulator

the fuel rail pressure sensor is located in between the high pressure line and the fuel rail on the passenger side. It will have 1 vacuum hose and one connector going to it.

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