P0191 2012 Ford Fusion 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 2012 Ford Fusion 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 2012 Ford Fusion 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 2012 Ford Fusion?
- 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 2012 Ford Fusion?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0191 2012 Ford Fusion 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 2012 Ford Fusion Code
1. What does the OBDII code P0191 mean for a 2012 Ford Fusion?
P0191 indicates a Fuel Rail Pressure Sensor Circuit Range/Performance issue, meaning the sensor detected fuel pressure outside the expected range.
2. What are common symptoms of code P0191 in a 2012 Ford Fusion?
Symptoms may include difficulty starting, engine stalling, rough idling, poor acceleration, and the Check Engine Light turning on.
3. What causes the P0191 code to appear in a 2012 Ford Fusion?
Common causes include a faulty fuel rail pressure sensor, damaged wiring or connectors, a failing fuel pump, or a clogged fuel filter.
4. Can I drive my 2012 Ford Fusion with the P0191 code?
Driving with this code is not recommended, as fuel pressure issues can lead to stalling or further engine damage.
5. How do I diagnose the P0191 code on a 2012 Ford Fusion?
Diagnose by checking fuel pressure with a gauge, inspecting the fuel rail pressure sensor, and examining the wiring and connectors for damage or corrosion.
6. How do I fix the P0191 code on my 2012 Ford Fusion?
Repairs may involve replacing the fuel rail pressure sensor, cleaning or replacing a clogged fuel filter, fixing damaged wiring, or replacing a faulty fuel pump.
7. How much does it cost to repair the P0191 code on a 2012 Ford Fusion?
Repair costs vary but typically range from $150 to $500, depending on whether the issue is with the sensor, wiring, or fuel pump.
8. Can a dirty fuel filter cause the P0191 code in a 2012 Ford Fusion?
Yes, a dirty or clogged fuel filter can restrict fuel flow, causing abnormal fuel pressure readings and triggering the code.
9. Does the P0191 code require a software update for a 2012 Ford Fusion?
In some cases, a software update for the powertrain control module (PCM) may be necessary if Ford has issued a technical service bulletin related to this issue.
10. Will clearing the P0191 code fix the problem in a 2012 Ford Fusion?
Clearing the code may temporarily turn off the Check Engine Light, but the underlying issue must be resolved to prevent the code from returning.
Discuss the causes and fixes for P0191 2012 Ford Fusion OBDII Code
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