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Discussion Starter #3
Thank you. Is it bank 1 bank 2 and what else? Getting a code P0240 pretty sure its a bad cat, not sure which one to replace.
 

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Don't do anything, as you may be replacing a cat for no reason. Do a search on the code.

First clear code, and it may be months before it comes back.
 

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There's a small cat on each bank of the engine and a big cat down under the car.

The downstream O2 sensors are after the small cats, so a P0420 would indicate that the catalyst for Bank 1 (firewall side of the engine) is not working as effectively as the car would like.
 
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