A/F Sensor 1
WARNING: This page is about a different car, the 2024 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
While O2 sensor changes output voltage by ON/OFF (rich/lean) mode within a narrow range of the stoichiometric ratio, the A/F sensor changes output voltage between 0 - 4 V for a wide range of air fuel ratio.
 Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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