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It had the codes before we changed them, still has them after replacementYou had no fault codes before you replaced the oxygen sensors right ? Sounds like a damaged harness or harness plug pins.
2000 Expedition Oxygen Sensor Wiring Diagrams
Apparently, the culprit isn't/wasn't the sensors themselves but their power source. Hamfisted pointed out the likely suspect.It had the codes before we changed them, still has them after replacement