P0191 1997 Ford F150 Code - Fuel Rail Pressure Sensor Circuit Range/Performance
Quick Answer
The Fuel Rail Pressure (FRP) Sensor is a diaphragm strain gauge device. Common causes include Low or no fuel, Faulty Fuel Rail Pressure (FRP) Sensor, FRP harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0191 1997 Ford F150 indicates Fuel Rail Pressure Sensor Circuit Range/Performance.
- Common causes
- Common causes include Low or no fuel, Faulty Fuel Rail Pressure (FRP) Sensor, FRP harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0191 1997 Ford F150 Description
The FRP sensor is located on the fuel rail and provides a feedback signal to indicate the fuel rail pressure to the Powertrain Control Module (PCM). The PCM uses the FRP signal to command the correct injector timing and pulse width for correct fuel delivery at all speed and load conditions. The FRP sensor, along with the fuel volume regulator (part of the fuel injection pump), forms a closed loop fuel pressure control system. An electrically faulted FRP sensor results in the deactivation of the fuel injection pump. Fuel pressure to injectors is then provided only by the FP module. When the fuel injection pump is de-energized and the injectors are active, the fuel rail pressure is approximately 70 kPa (10 psi) lower than FP module pressure due to the pressure drop across the fuel injection pump. Thus, if the FP module pressure is 448 kPa (65 psi), then the fuel rail pressure would be approximately 379 kPa (55 psi) if the injectors are active.
What are the Possible Causes of the DTC P0191 1997 Ford F150?
- Low or no fuel
- Faulty Fuel Rail Pressure (FRP) Sensor
- FRP harness is open or shorted
- FRP circuit poor electrical connection
- Faulty Fuel Pump
How to Fix the DTC P0191 1997 Ford F150?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
A FRP PID value during KOER of 138 kpa (20 psi) and 413 kpa (60 psi) for gasoline or 586 kpa (85 psi) and 725 kpa (105 psi) for natural gas vehicles (NG) is acceptable.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0191 1997 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0191 1997 Ford F150 Code
1. What does OBDII code P0191 mean on a 1997 Ford F150?
P0191 indicates a problem with the Fuel Rail Pressure Sensor Circuit, specifically that the signal is out of the expected range or performance is compromised.
2. What are the common symptoms of a P0191 code in a 1997 Ford F150?
Common symptoms include hard starting, engine stalling, rough idle, poor fuel economy, reduced engine power, and the Check Engine Light being illuminated.
3. What causes the P0191 code to appear on a 1997 Ford F150?
Possible causes include a faulty fuel rail pressure sensor, wiring or connector issues in the sensor circuit, a failing fuel pump, clogged fuel filter, or low fuel pressure.
4. How do I diagnose a P0191 code on my 1997 Ford F150?
Diagnose by checking the fuel rail pressure sensor, inspecting wiring and connectors, testing fuel pressure with a gauge, and examining the fuel pump and fuel filter for issues.
5. Can a bad fuel pump cause the P0191 code on a 1997 Ford F150?
Yes, a failing fuel pump can cause inconsistent fuel pressure, triggering the P0191 code.
6. How do you fix the P0191 code on a 1997 Ford F150?
Repairs may include replacing the fuel rail pressure sensor, repairing damaged wiring or connectors, replacing the fuel pump, or cleaning/replacing the fuel filter.
7. Is it safe to drive with a P0191 code on a 1997 Ford F150?
It’s not recommended to drive for extended periods with this code, as it can lead to engine performance issues and potential damage if fuel pressure problems are severe.
8. How much does it cost to fix a P0191 code on a 1997 Ford F150?
Repair costs vary depending on the issue. Replacing the fuel rail pressure sensor might cost $150-$300, while fuel pump replacement can run $400-$800, including labor.
9. Can a clogged fuel filter trigger the P0191 code on a 1997 Ford F150?
Yes, a clogged fuel filter can restrict fuel flow, leading to incorrect pressure readings and triggering the P0191 code.
10. What tools are needed to troubleshoot the P0191 code on a 1997 Ford F150?
Basic tools include an OBDII scanner, a fuel pressure gauge, a multimeter for testing electrical connections, and possibly fuel system cleaning tools.
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