I just got this code resolved after a long time. My mechanic found a crack in my catalytic convertor. Once welded up, the code went away. He explained that the code is triggered when there is a mismatch between the O2 sensors. Since the crack let in fresh air into one side, there was a mismatch and the code was triggered. So, check the cat for cracks, especially around the connection points or hangars. Good luck.
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