Re: Rear O2 Sensor Removal tips? - Saab 9-5 Bulletin Board - Saabnet.com
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Both types of wrenches work according to situation. We have also cut the wire and used a six point socket (that doesn't open up from hi torque) or some fancy closed wrenches. Seems they come either with anti seize on or they give you a small packet of "copper" type anti-seize. And it prudent to wet down the O2 with penetrant daily for a week if you have that luxury. The freeze off products can work well too by creating microcracks that are deluged with penetrant at the same time. Taking off hot is apparently the consensus best way to go. Heating with propane and cooling with ice water is another technique. Still the passenger side rear on a Jeep Wrangler was a nightmare to remove. We threw everything at it. It's kissing cousin upstream was a snap. I find the easy removal of an o2 sensor one of the most satisfying of human feelings since I have experienced the darkness and frustration of dealing with the opposite.
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