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Automotive code p0191 - 2006 Ford Mustang

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P0191: Fuel Rail Pressure Sensor CKT Range/Perf

- 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

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.

Posted on Feb 07, 2012

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Posted on Jan 02, 2017

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I'm getting a p0191 sensor 1 on my 2007 explorer. Replaced maf sensor + fuel pressure sensor + fuel pump. Light comes on when engine warm +and then hard to start.


P0191 Ford Fuel Rail Pressure Sensor Circuit Range Performance

SENSOR 1 ??????????? There is no sensor one involved here . After replacing all those parts an not fixing the problem ,suggest you take it to a qualified repair shop. The proper thing to do would be to do the diagnostic's for code P0191 . Do you know what a factory diagnostic flow chart is ? How to test electrical circuits ?

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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


You need to have the fuel pressure checked, to see if the fuel pump or fuel filter may have a problem. The code is for the Fuel Rail Pressure sensor, and the reading from it is out of range.

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P0191 fuel rail pressure
P0191.....may be the wiring or the fuel rail pressure sensor.. China OBD2 car diagnostic tools wholesale on CareUCar

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galletto 2

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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
-

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