Hi:
The converter was under a service bulletin. I believe 2000 to 2002 impala vehicles were covered up to 120K. If your cat was replaced with an aftermarket, that may be the problem. Here is a letter I found regarding a 2001 impella. I recommend contacting a dealer and see if the problem is covered under warranty, (10 year / 120K) as a result of a recall.
Here is the letter I found.
I realize it may not be readable. But there is an 800 number to call if you feel your car is having problems. It is 1800-630-2438 (Chevrolet Customer Assistance). Let me know if they help.
Joe
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Saturday, March 7th, 2009 AT 9:52 PM