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My point is that the only way cats really go bad is from1. Age - the catalyst is slowly used up. This generally takes well over 100k miles to happen.2. Physical damage - you ran over a rock big enough to crack the sucker.I'd ask them about exactly what's wrong with the cat - better yet, have your brother/uncle/cousin/father-in-law who knows cars pretty well call them - someone who will be able to tell if they're blowing smoke. I would imagine it would take some damage to the O2 sensor (generally mounted just upstream of the cat) to cause the check engine light, etc. you've been seeing, so ask them if the oxygen sensor is being replaced as well.
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