how do you know the used o2 you replaced it with is known good or not

also, note that the angle of upstream o2's need to face slightly away from the flow of exhaust gases. this prevents condensation which kills o2 sensors. Just and FYI

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Outside of Corona: "That sucks, peace out..." (jamie walks away)... "Sweeet, what we doin?" -Zac
Tim's garage (prior to motor install): "Im gonna smoke real quick, that way if you fuck up I am already nicotined up" -Tim