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What makes O2 sensors go bad? On my 97 f-250 4x4 ld 5.4 they go out like all the time. Maybe get a year out of a pair if that. Anyway to kill this bird for good?
If they truly are going bad I'd look for either an extreme lean or extreme rich burn of your fuel, other than that all I could think of is a wire shorting something out or if you drive in a hellova lot of standing water maybe it fries them. Is it all 4 that go bad or just the post cat or pre-cat?