DTC P0451: Evaporative Emission (EVAP) System FTP Sensor Range / Performance / Intermittent
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P0451 - EVAPORATIVE EMISSION (EVAP) SYSTEM FTP SENSOR RANGE / PERFORMANCE / INTERMITTENT
| Description: | Note: For some 2005 applications, DTC P0451 will be set for a fuel tank pressure (FTP) sensor range (offset) fault. DTC P0454 will replace the original P0451 for intermittent (noisy) sensor faults. Until the phase in process is complete, noisy or offset FTP sensor faults may set a P0451. The fuel tank pressure changes greater than 14 inches of water in 0.10 seconds. FTP sensor output is offset by + /-1.7 inches H2O. |
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| Diagnostic Aids: | Monitor the FTP PID and note if it changes from above 15 inches of water to below minus (-) 15 inches of water often in 1 minute. With the FTP sensor at atmospheric pressure, the FTP PID normally indicates 0 inches of H2O. Look for a minimum reading of +/-1.7 inches of water as an indication of an offset condition. |
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| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to HX: Evaporative Emission (EVAP) Monitor and System STEP HX46. | ||