What Does P043F Code Mean?

    OBD-II Code P043F is defined as a Evaporative Emission System Leak Detection Reference Orifice

    The Leak Detection Pump contains a reference orifice tube. This tube restricts airflow to create a difference of pressure in the EVAP system. If the Orifice tube becomes clogged with debris, the engine computer (PCM) will set code P043F. The orifice tube is replaced as a unit with the leak detection pump module/assembly.

    Common Problems That Trigger the P043F Code

    • Evap line leak/restriction
    • Leak detection pump module failure
    • Wiring issue

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