The one I got bad out of the box was a DELPHI, supposed to be OEM good. But wasn't. I realize any thing can suffer crib death but O2 sensors seem to have more of an issue with being dead out of the box than should be expected.
It seems all that has to happen is they get mishandled i.e. Dropped and they are no good.
A friend of mine went thru 4 consecutive sensors recently before the 5th was good. If the auto parts store didn't know him well, and his reputation for being an excellent technician, they would not have believed that a batch of 4 sensors were bad but they were.
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98 Riv, 102K Miles, EBC, LS1 Ft.Calipers, STB, Addco Rr Sway Bar, 180* stat., SSAC Headers, HF Cat, 1.9's,
105# springs, MPS 3.4, DHP tuned by the Deekster.