Service Engine Soon Light

I have a 2001 Blazer, and recently I noticed the Service Engine Soon light had come on. I went to AutoZone and had them read it and the guy gave me a code PO410, a malfunction in the secondary air system. Now that's all well and great, but I have no idea what I need to do to fix it, nor about what it should cost to do so. Anyone have any insight as to how much I can expect to pay for repairs and what, if anything, needs repair?

Clueless

I'm not sure what the code means, but make sure your gas cap is on tightly. A loose cap can cause the light to come on. Good Luck

If you would have done a search you would have found 4 threads in this forum about the code you asked about. The one with the msot info and help is located at..............
http://www.automotiveforums.com/vbulletin/showthread.php?t=295513&highlight=po410

Don't wanna sound mean or anything but this forum is kinda filling up b/c people don't wanna search or maybe they don't know that the function exists. There is a link for your help.