P0191 - Fuel Rail Pressure Sensor A Circuit Range/Performance
WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 2014 Lincoln Navigator, 2014 Lincoln MKZ, 2014 Lincoln MKX, 2014 Lincoln MKT, and 2014 Lincoln MKS. However, it is still accessible from the selected car via links, so may be relevant.
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: FUEL PRESSURE, FUEL RAIL PRESSURE (FRP) AND FUEL RAIL PRESSURE TEMPERATURE (FRPT) SENSORS . | ||