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Air Fuel Ratio (A/F) Sensor

The A/F sensor operates over a wide air/fuel range. The A/F sensor is installed upstream of the warm up three way catalytic converter (WU-TWC), and it sends signals to the PCM which varies the duration of fuel injection accordingly.

Fig 1: Cross-Section View Of Air Fuel Ratio (A/F) Sensor
G08092177Courtesy of AMERICAN HONDA MOTOR CO., INC.
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