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If your sensor didn't come with any anti-seize on the threads, be sure to apply some to make replacing it in the distant future a bit easier.
The second picture shows the grimy old sensor. I'm not really sure when it was replaced last, but judging from the buildup on it I'd say replacing it sure won't hurt anything.
The little slits in the side of the sensor tip are where exhaust gases enter. For more information on oxygen sensor operational theory, check out the oxygen sensor Wikipedia page.
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