Closes thing I could find for an answer:
1.) The catalyst in the catalytic converter is cracked, clogged, or otherwise damaged. 2.) The secondary O2 sensor is malfunctioning. 3.) There is an exhaust leak. 4.) The computer unit is faulty.
You may have burned up one of the cats and it is now clogged or very restricted or possibly an O2 sensor is bad (though usually O2 sensor is a different code).
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