SES light after catalytic converter replaced

[mtrain]

I know I saw this before while searching but now I can' find it.
After replacing my catalytic converter on my 2002 Grand Am GT w/ 3.4 L V6, I'm getting a fault code from the sensor after the converter which causes the SES light to stay on. There is an item that you can buy that tells the computer that all is okay. Where can I get one of those?

[GTP Dad]

You need an O2 simulator. I know that ZZPerformance sells them but you can also try PFYC.com or andysautosport.com.

[mtrain]

Thank you very much for your response.

David