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Most oxygen sensors are located on the exhaust just below the exhaust manifold. Some are located further down the exhaust stream on the pipe.Assuming you have a 2.8 V6 it should be just after the manifold. 4 cylinder engines should be the same. This sensor senses (you guessed it) the amount of oxygen in the exhaust stream. This helps the vehicles computer determine the corretc amount of fuel to inject into the engine according to a given load.
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