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Oxygen sensor #1 screws in to the exhaust manifold just before the headpipe. The hardest part about replacing an oxygen sensor is screwing it out. Sometimes they are a little siezed in from the heat. after you get the old one out, you'll need to make sure you know how to electrically connect the new one. Some of the replacement oxygen sensors have a plug and others need to be spliced in. Just make sure you connect the wires correctly, following the color codes or the directions that came with the replacment sensor. It's relatively easy and a good first auto repair project.

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