Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2011MARINER PREMIER, 2.5 7, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS - DTC P0001 THROUGH DTC P0217 - (EXCEPT DIESEL & HYBRID)DTC P0191: FUEL RAIL PRESSURE SENSOR A CIRCUIT RANGE/PERFORMANCE
2011 Mercury Mariner Premier, 2.5 7, AWD
DTC P0191: Fuel Rail Pressure Sensor A Circuit Range/Performance
2011 Mercury Mariner Premier, 2.5 7, AWDSECTION DTC P0191: Fuel Rail Pressure Sensor A Circuit Range/Performance
P0191 - FUEL RAIL PRESSURE SENSOR A CIRCUIT RANGE/PERFORMANCE
| Description: | The comprehensive component monitor (CCM) checks the fuel rail pressure (FRP) sensor for an acceptable fuel pressure. The test fails when the difference between the fuel rail pressure requested by the PCM and the fuel rail pressure delivered exceeds 138 kPa (20 psi) for greater than 8 seconds. | ||
| Possible Causes: |
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| Diagnostic Aids: | |||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST DD . | ||
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.