The air-fuel ratio sensor (AFS) has the ability to measure air-fuel ratios from as lean as 35:1 to as rich as 11:1.

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The air-fuel ratio sensor (AFS), also known as a wideband oxygen sensor, is designed to provide feedback to the engine control unit (ECU) over a wide range of air-fuel ratios, allowing it to accurately measure very lean mixtures around 35:1 to very rich mixtures around 11:1, unlike traditional oxygen sensors which are limited to a narrow band around the stoichiometric point of 14.7:1.

The Air-Fuel Ratio Sensor (AFS) Has the Ability to Measure