2003 Chevy Venture 02 Censor Light comes on, changed it, now its running to lean?

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Mrbigjohnson

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I took it to a mechanic and he said that it was a defective 02 censor, so I replaced it and the same code is still displayed. And his reader is saying that the 02 censor is telling the computer that it is running to rich so the computer leans it out when its not running rich so the engine will run rough and sometimes stall. This is the 3rd 02 censor so I know that that's not it. Any other ideas.
Thanks
 
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