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First off, the o2 sensor sockets are almost all junk! snip the wires off with enough that you can crimp them back together if you really need to, then get a real, good socket for an impact wrench and get it off that way.
the o2 sensor doesn't start giving the engine a reading until it's 600F so your new sensor is telling the ecu that the sensor is good but you are going to burn up the heating element in it if you keep it plugged in without it being installed.
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