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Replacing one typically just throws another CE light and can cause poor fuel economy or a rough idle and even lousy performance down the road because of differences in the sensitivity levels of the older, burned sensors compared to the new, highly sensitive one. This is why Porsche recommends that all four are replaced at the same time.
I did not use a lift to replace mine. I used ramps and had plenty of room to work.
The oxygen sensor wrench tool is required as the space is just too tight to get an open ended wrench up into the space.
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