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The oxygen sensor measures the amount of or lack of oxygen in the burnt exhaust exiting the engine in the exhaust pipe. It will then send a voltage signal to the vehicle computer. The computer uses that signal to control the fuel metering coming into the engine to try and keep the air/fuel ratio at 14.7 parts air to 1 part fuel. This is for emissions and economy reasons.

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Q: What does the oxygen sensor do on the car?
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