2k2CamaroZ28

I was driving the other day and I noticed the ses light was on. I had it scaned and it threw the code p0410. I did a search on ls1.com and now i know what it is, but i have no clue how to fix it. I have a 2002 z28 with long tube headers, off road y-pipe w/ o2 sims, rockers, exhaust and a few other minor mods. Any thoughts on how to fix the code would be greatly appreciated.

------
2002 Camaro Z28
12.9 @ 109.2 (before headers, tb, maf)
borla, whisper lid, hooker long tube, off road y, 1.85 rockers, s.s. ram air, functional ram air hood, ported tb, ported maf ends, slp smooth bellow, slp sfc, slp rear sway bar