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Just unscrew it and replace the wiring.

The upper oxygen sensor is on the exhaust manifold, close to the headpipe.

The replacement sensors are often plug compatible, but others must be spliced in to the old wiring. If you end up with that, refer to the instruction to figure out where the wires go.

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Q: How do you replace the upper oxygen sensor on a 2000 Saturn SL1?
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