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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> DTC Diagnosis >> DTC P0451: - Evaporative Emission System Pressure Sensor/Switch Range/Performance

DTC P0451: - Evaporative Emission System Pressure Sensor/Switch Range/Performance

DTC P0451: - EVAPORATIVE EMISSION SYSTEM PRESSURE SENSOR/SWITCH RANGE/PERFORMANCE

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: 
  • Intermittent open or short in the FTP sensor or the FTP sensor signal
  • Contaminated or damaged sensor
  • Damaged powertrain control module (PCM)
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 
All GO to Pinpoint Test HX .