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Pcm code p0191 - Land Rover Cars & Trucks

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Vehicle CEL is on, various codes


P0300 is a random miss fire , a vacuum leak can cause this as well as low fuel pressure ! weak fuel pump , clogged fuel filter !
DTC P0171: Fuel Trim System Lean Bank 1
DTC P0174: Fuel Trim System Lean Bank 2 These two codes are saying the PCM - engine computer is see a lean condition .
DTC P0191: Fuel Rail Pressure (FRP) Sensor Performance
Circuit/System Description
The fuel pressure sensor is located on the fuel line. The fuel pressure sensor monitors the fuel pressure in the fuel line. The fuel pump flow control module (FPCM) monitors the voltage signal from the fuel pressure sensor.

You don't say what make , model an year vehicle ! These are for GM vehicles , yours could mean something else . Except the first three , those are genaric codes , same for all makes ! So can't say what this codes are P2097, and P2099 ! Can't mean this P2097 - Post Catalyst Fuel Trim System Too Rich Bank 1
P2099 - Post Catalyst Fuel Trim System Too Rich Bank 2

Sep 03, 2016 | Cars & Trucks

1 Answer

My 2007 Toyota isis iaz.read code P0191


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
    "I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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

May 03, 2016 | Toyota Cars & Trucks

1 Answer

How do I fix code P0191 on 2013 duramax?


code p0191 refers to rail pressure(FRP) sensor--range/performance problem===causes-- wiring-- FRP sensor.
check for air in the fuel system after a filter change
check FRP sensor and wiring is connected properly.

Mar 06, 2015 | Cars & Trucks

1 Answer

Ford escape code p0191


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.

Aug 12, 2014 | 2008 Ford Escape

1 Answer

What is the fix for code P0191 on 2012 sonata


fuel rail pressure sensor readings out of range ,i'd suggest taking to a mechanic with diagnostic equipment as could be anything fro low fuel pressure to the PCM having a fault , not the sort of thing to attempt without diagnostice equipment

Jun 17, 2014 | 2001 Hyundai Sonata

1 Answer

Code P0191 what is the fix?


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

Jun 17, 2014 | 2012 Hyundai Sonata GLS Sedan 2.4L 4-cyl....

1 Answer

Automotive code p0191


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.

Feb 07, 2012 | 2006 Ford Mustang

2 Answers

2005 freestar emission lite on code P10191&P193


Both codes P0191 and P0193 on Ford means Fuel Rail Pressure Sensor Circuit High Conditions. That means that the PCM detected that the FRP sensor signal was more than 4.5v.

Possible causes:
* FRP signal shorted to VREF or VPWR.
* FRP signal open
* Damaged FRP sensor.
* Damaged PCM.

Check ground connections.

Sep 12, 2011 | Ford Freestar Cars & Trucks

1 Answer

Hi. I have a 2003 Ford Focus LX. A few weeks ago, I was driving back to Florida from South Carolina. About six hours into the drive, my car stopped accelerating. I would push down on the gas pedal and...


Diagnostic Test code (DTC) P0191 has a generic description which reads "Fuel Rail Pressure (FRP)Sensor Circuit Performance"

This code sets when the Powertrain Control Module (PCM) is monitoring the fuel rail pressure sensor signal under certain driving conditions. The FRP sensor varies return voltage to the PCM to indicate the fuel pressure at the fuel rail on the engine. DTC P0191 sets when the voltage received from the FRP is above or below the expected "range" or "threshold".

The possible causes of this code are:

> High fuel pressure
> Low fuel pressure
> Damaged Fuel Rail Pressure Sensor (FRP)
> Excessive resistance in FRP circuits.
> Low or no fuel

With all of that said, I would recommend that if you have more than 30,000 miles on your current fuel filter, I would try that FIRST. Replace the filter and clear the code. If the code returns, then diagnostics will need to be performed to find the actual cause.

Aug 11, 2011 | 2002 Ford Taurus

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