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catalytic conver

  1. Is My Catalytic Conv. Bad?

    3.7L V6
    Hi there, I have a 2009 Mazda 6 3.7 v6. It has about 145,000 miles on it. Car is sounding louder normal. Could this be a bad cat or leak in the manifold. I’m attaching a picture of the O2 readings, I was told that the output should be constant and not jumping around like the first sensor...
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