S-10 check engine light

I have a 1998 S-10, I took it to have it smogged and told to change the cat. conv., after the light would go off. Well I changed it and the light is still on. Everything else passed. ANY IDEAS!

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EGR value....it might need cleaning.

http://www.autoforumz.com/Chevrolet-10-check-engine-light-ftopict107047.html
http://www.autoforumz.com/eform.php?pI9218
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