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foot on an O2 sensor doesn't mean it's going to come out, at least on stock precats. Even after I switched to SZ DPs, and had the precats out of the car, I couldn't get the sensors out. Used PB Blaster... just too rusted on. Definitely worth a try, however. Now if the sensors are mounted on stainless DP, that's a different story.
 Chance favors the informed
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