DTC P0451: Evaporative Emission System Pressure Sensor/Switch Range/Performance
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.
P0451 - EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR/SWITCH RANGE/PERFORMANCE
| For Vehicles With NVLD Module | |||
| Description: | This DTC sets if the natural vacuum leak detection (NVLD) module pressure switch does not respond to pressure changes in the EVAP system. | ||
| Possible Causes: |
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| Diagnostic Aids: | |||
| For All Others | |||
| Description: | This DTC sets for a fuel tank pressure (FTP) sensor range (offset) concern. The FTP sensor output is offset by greater than 1.7 inches of water or less than -1.7 inches of water. | ||
| Possible Causes: |
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| Diagnostic Aids: | With the FTP sensor at atmospheric pressure, the FTP PID normally indicates 0 inches of water. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Fiesta | GO to PINPOINT TEST HZ . | ||
| All others | GO to PINPOINT TEST HX . | ||