What is an AFR and how is it different from an O2 sensor?

Many modern vehicles use what’s called an Air Fuel Ratio sensor (AFR), though many mechanics and some repair manuals will refer to them as O2 (oxygen) sensors. They fill the same role on the vehicle and are covered by the same OBD II codes when scanning the vehicle’s computer for errors.

So what is the difference between an AFR and an O2 sensor? And why does it matter?

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