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  1. #1 Re: Info about catalytic converter 
    GTP Level Member SuperSport's Avatar
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    Welcome. It seems only the GM converters from 01-02 GP's with the 3.8 seem to clog, and Id have a hard time believing that any aftermarket converter would clog. Ask him how he knows yours is aftermarket, and let him know that the cat warranty is extended to 10 years, 120,000 miles, regardless of owner. If all else fails, take it to another GM dealership. I just had mine changed out last week because my cat was clogged, and the car wouldnt go over 15mph. The previous owner thought it was the trans that was bad haha.
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  2. #2 Re: Info about catalytic converter 
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    Thanks for your help. I just picked up the car. He said that the number on the cat didn't match an original one and thats how they knew. He also said my service engine light is on because the throttle body is not working properly in addition to the cat. So after $115 diagnostic to find the 2 codes of what is wrong I still do not have it fixed since this whole situation with the cat sounced very suspect. I guess I am going to have to go under it and see if I can tell if it is an aftermarket. I would just hate to bring it to another dealer for them to charge me and tell me again that the cat is aftermarket.
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  3. #3 Re: Info about catalytic converter 
    GTP Level Member SuperSport's Avatar
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    Worst comes to worst just order a cat online and take it to an exhaust shop and get it changed there.

    What are your symptoms that you suspect its the cat? I mean, a SES light doesnt automatically mean the cat is bad...
    2001 Grand Prix GT Coupe
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