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Re: Anyone had to replace the Catalytic Converter?
A bad or clogged CAT convertor on an Alero 3.4L is uncommon but has been known to happen. I have a family member with a '01 Grand AM GT (3.4L) and the CAT was diagnosed bad with only 58K miles on the odometer. GM might have used flaky CATs on some 2001 - 2002 models. How many miles do you have because the CAT has a warranty to 80K miles or 8 years, whichever comes first.
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