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DTC P0451: EVAP Control System Pressure Sensor Range/Performance

WARNING: This page is about a different car, the 1999 Suzuki Vitara. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove tank pressure sensor from fuel tank. Check vent hole and pressure passage for clogging. Clean as necessary. If no problem is found, go to next step.
  2. Check fuel tank pressure sensor performance. See FUEL TANK PRESSURE SENSOR in SYSTEM & COMPONENT TESTING article. Replace as necessary. If tank pressure sensor is okay, check for open or short circuits in Brown/Red, Gray/Red or Gray/Yellow wires between fuel tank pressure sensor and PCM. Repair as necessary. If wiring and connections are okay, replace PCM and retest system.
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