P0191 1999 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 1999 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 1999 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 1999 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 1999 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 1999 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 1999 Ford F150 Code
1. What are common symptoms of OBDII code P0191 on a 1999 Ford F150?
- Common symptoms include rough idling, engine hesitation, poor fuel economy, and potential stalling.
2. What does the OBDII code P0191 Fuel Rail Pressure Sensor Circuit Range/Performance mean for a 1999 Ford F150?
- This code indicates that the fuel rail pressure sensor is detecting a voltage signal outside the expected range, affecting the engine's fuel delivery.
3. What are possible causes of OBDII code P0191 on a 1999 Ford F150?
- Potential causes include a faulty fuel rail pressure sensor, issues with the fuel pump, clogged fuel filter, wiring problems, or a malfunctioning fuel pressure regulator.
4. How can I diagnose the OBDII code P0191 on my 1999 Ford F150?
- Diagnosing the issue involves checking the fuel pressure using a gauge, inspecting the fuel rail pressure sensor and related wiring for damage, and testing the fuel pump's functionality.
5. Can I drive my 1999 Ford F150 with the OBDII code P0191?
- It is not recommended to drive with this code as it can lead to performance issues and potential engine damage due to incorrect fuel delivery.
6. How can I repair OBDII code P0191 on a 1999 Ford F150?
- Repair steps may include replacing the fuel rail pressure sensor, checking and cleaning the fuel system components, ensuring proper wiring connections, and resetting the trouble code.
7. Is it safe to reset the OBDII code P0191 on a 1999 Ford F150?
- Resetting the code without addressing the underlying issue may temporarily clear the warning light, but the problem will persist and likely trigger the code again.
8. Can a DIY enthusiast fix the OBDII code P0191 on a 1999 Ford F150?
- Depending on the DIYer's skill level and access to tools, some may be able to address this issue by following repair guides and consulting with professionals if needed.
9. How much does it cost to repair OBDII code P0191 on a 1999 Ford F150?
- The cost of repairs can vary based on the specific cause, parts needed, labor charges, and whether the work is done at a dealership or an independent mechanic.
10. Will OBDII code P0191 on a 1999 Ford F150 affect the vehicle's emissions?
- Yes, this code can affect emissions by causing improper fuel combustion and potentially leading to increased emissions output.
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