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Counterman Education Center

VIDEO: A Closer Look At Oxygen Sensors

In a closed-loop system, the O2 sensor monitors the air/fuel ratio 100 times per second to make minor fuel-trim corrections.

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To produce power, an engine needs three things: air, fuel and an ignition source. 

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The air-fuel ratio is key. When we talk about the air-fuel mixture, it can be rich – when there’s too much fuel. It can be lean – when there’s not enough fuel. Or it can be … just right.

When the air-fuel ratio is just right, the engine is burning fuel at maximum efficiency, which some people call the stoichiometric ratio, or even just “stoich.” Oxygen sensors play a very important role in all of this.

This video is sponsored by the Automotive Distribution Network.  

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