DTC P0191: - Fuel Rail Pressure Sensor A Circuit Range/Performance
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2009 Mercury Mountaineer, 2009 Mercury Milan, 2009 Mercury Mariner, 2009 Mercury Grand Marquis, and 2009 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
DTC 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 fuel pressure falls below or exceeds a minimum/maximum calibrated value for a calibrated period of time. | ||
| Possible Causes: |
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| Diagnostic Aids: | A FRP PID value during ignition ON, engine running of 138 kPa (20 psi) to 413 kPa (60 psi) is acceptable. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to Pinpoint Test DD . | ||