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My regular mechanic thinks the cat converter in my 2001 GXE needs replacing. I took it in for an intermittent P0420 code. They checked the cat, and think it's bad. I called the dealer to pick their brain, and he thinks that something else (I'm sorry, I forget what he said) MIGHT be causing the cat to look worse on testing than it really is, so I am going to let them check it, too. The car runs fine. If the cat IS bad, what would I notice in terms of how the car runs, mileage, etc.?
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