Question about 2004 Chevrolet TrailBlazer

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Where are the co2 sensors located on a 2004 chevrolet trailblazer 6 cylinder?

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O2 sensors are located just before the catalytic converter on the exhaust pipe coming down from the exhaust manifold. You will have two pipes that will merge with catalytic converter exhaust pipe. They will be sticking out from these pipes. You will need a o2 sensor removal tool if there is no room for an open end wrench. This tool is not expensive and looks like a deep well socket with a slot running length wise. Under $10.00. Make sure there is plenty of anti seize on the threads. so next time they will be easy to remove.

Posted on Jan 01, 2011

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Posted on Jan 02, 2017

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