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I own a 01 Chevy Impala. I had a mechanic shop put an after market converter on my car for me. It cost about $200. Later my check engine light came on. It was because of the cat. The oxygen sensor was saying it wasn't getting enough oxygen because the cat's chamber was too small or something like that. I have a 1 year warranty on the cat, so I asked the shop what they could do. They said it is a low end cat, and its been known to do that. They said they weren't sure if it would be covered by warranty because nothing was wrong with the cat - It didn't stop working or break. They said it wasn't affecting performance. They said they would look into it, and hinted that I could use the $200 to upgrade to a better cat. A GM cat costs $600. They never called back, and I was so frustrated I haven't called them back for a month. Should this be covered by warranty? Do I have to have them do the next install or can I get a refund to have someone else put it in? What should I do?
I believe I had no original warranty as the car had 122,000 miles on it. The o2 sensor was not going off with the old cat. I was having performance problems and it was found that the cat was very clogged. I had to replace my tranny a few months before I replaced my cat.
 
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Hmm,n a 2001, GM should honor the warranty (generally 10 years on emissions system parts, including the catalytic convertor). Probably too late now that an after-market unit has been installed, but I would check anyway.The Cat itself is not defective it sounds like they installed too small of a catalytic converter on your car I would tell them to fix it properly if they don't then report them to the better business bureau and consider hiring an attorney. I would take it somewhere else to make sure but that is what it sounds like.

Beware of imposter parts!

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I thought the federal emission warranty was 8 years or 80,000 miles. 122k probably puts him out of any warranty, even if I'm wrong about the warranty limits. Definitely sounds like they put a bad cat on though- not that the cat is necessarily broken, just not adaequate.

There's also a possibility that your o2 sensor could be the culprit. Try switching the rear one to the front and see if you still get the same code. If so, it's the cat. If not, it's the o2 sensor.
 

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They knew that the cat was to small, so they should have told you what size you need when you first took the car in to them. Yes they should replace it and give you a better discount on the proper one and not charge for the labor of switching them out. I would go and complain to the manager/owner or the main office.
 
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