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one sensor is located after the catalytic converter on the exhaust pipe just about mid vehicle. I believe there is a second one but not sure of its location yet. For the 5.4l, there are 4 O2 sensors. All are the same model. Two in front of the cat just past the manifold - to - Y-pipe connection and then just past the cats. For the 4.6L, there is also 4 02 sensors. 2 before cat. and 2 behind cat. around $50.00 each at auto zone.

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Q: What is the location of the oxygen sensor on a 1998 for Expedition?
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