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I have one that I think it still good but have another one that just needs to be soldered back together since the wire came off....not sure how legit that is but figured Rob could fix it!
well considering the ecu uses o2 sensor readings to adjust the a/f ratio it is possible. likely you'll just notice lower performance and worse gas mileage since it will probably go into a safe mode.
you have upstream and downstream. Total of 4. 2 up top in the headers and 2 in the cats. What is the problem with yours? do you have an SES light?? did you check codes which is the reason your mentioning on having bad o2 sensors?
the header o2's read hot signal and rears read cold.