Question about 2003 Chevrolet TrailBlazer

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Locate 02 sensor

How to replace 02 sensor

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  • Chevrolet Master
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On the I6 engine, the precat sensor is located on the passenger side of the engine right below the exhaust manifold. Easty to get to, unplug the sensor and use an 02 sensor socket to remove. Post cat sensor is underneath after the cat. The connector to unplug is located in a difficult position, near the top of the transmission. I find that moving yourself toward the rear of the car and reach in the easiest. As opposed to reaching in right above the 02 sensor.

Posted on May 16, 2014

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Posted on Jan 02, 2017

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