IntrepidII -Catalytic converter, how to tell it is not working

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Intrepid II - Model 1303---Catalytic converter, how to tell it is not working and needs to be replaced?
Somehow I accidentally posted before I finished

I looked at the CC and it was all crapped up. Put it back in. Seems all is fine when stove is running hot, but when It cools down smoke can be smelled. Any Ideas would be great to hear---Thanks---Bob