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The code references an inefficiency in the cat. Your O2 sensors are fine. I wouldnt take a chance on the oil thing. You can also run fuel injector cleaner in your gas. It will burn a little hotter and may causenthe light to go out temporarily. I went through both sets on my x twice when I had it. I also drove about 60k miles on the first set as they didn't seem to be clogged. When I pulled them there was no breakdown of the material visibly. That being said, there have been a few that had the cats break up and pieces get sucked into the engine which is not good. I believe all of those cases were premature failure though.
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