I'm trying to figure out why all of a sudden something went wrong just by replacing an O2 sensor. Like I mentioned before, this is a hard one to begin with just because a shear description doesn't necessarily help. To be perfectly honest with you, I am worried that you may have a DME problem and might need a new unit. Then again, what you describe could be an issue with a bad Catalytic converter. If you want to test that theory, disconnect the header pipe to cat. converter connection and then start the car. It will be very loud but if the car runs fine then you have your problem. It's possible that the 02 sensor was showing faults because of the faulty cat. That would be a cheap and effective way to eliminate some possibilities. Let me know what you find out......
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