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    O2 sensors going bad

    hi everyone, I am having a problem with my 2000 Ford Expedition 5.4L a few months ago I tuned it up, replaced the coils and o2 sensors also at the same time, it ran great for two months then the o2 sensor right side upstream went out I figured ( damm eBay) so I replaced it again, then yesterday...
  2. C

    99 5.4L o2sensors

    Hey everyone, I'm new here but have been the field for a lot of years, 1999 expedition 5.4L, three months ago I replaced all the coils and tuned up, then I replaced all four of the o2 sensors a month, now I have codes po151 and p1151. Has anyone had problems with wiring issues on o2 sensors ?
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