LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2024 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 4) >> Engine (ECM) >> DTC P0451: EVAP Control System Pressure Sensor >> DTC Diagnosis Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Diagnosis Procedure

  1. CHECK HOSE AND PIPING 
    1. Turn ignition switch OFF.
    2. Check the following.
      • Blockage, crush, or damage in the hose and the piping of EVAP purge line between fuel tank and intake manifold.
      • Blockage, crush, or damage in the hose and the piping of intake air passage between inlet air duct and intake manifold.

    Is the inspection result normal?

    YES>>

    GO TO 2.

    NO>>

    Repair or replace error-detected parts.

  2. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Check EVAP control system pressure sensor. Refer to Component Inspection . Is the inspection result normal?

    YES>>

    Replace ECM (built in barometric pressure sensor).

    NO>>

    Replace EVAP control system pressure sensor. Refer to EVAP CANISTER : Removal and Installation .