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The one O2 Sensor I took out came out without any problems. I did check my MAF sensor with the Durametric, it's functioning fine.
Here is where what I think caused my cat problems. My AOS was going out, not doing the heavy smoke deal or anything like that, but when I put in the new intake system there was oil in the Distribution T and the line from the AOS. Why this AOS didn't just give up and blow like most I don't know, but it went on long enough that my car threw a CEL for the cats. So I'm pretty sure they are mucked up and bad.
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Yes that would do it! however, burning oil can mess up the cats too. I'm hoping for you the O2 sensors solve it.
Fingers crossed!!