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The O2 sensors are located between the exhaust manifolds and the cat converter. They screw in to the head pipes.

Those are also called upstream O2 sensors and in some vehicles they are also called air/fuel sensors. There are also downstream O2 sensors that are located after the catalytic converter.

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โˆ™ 2016-12-17 16:50:19
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Q: Where are the O2 sensors on a 1999 Silverado Z71?
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