code

Have a 2000 bravada and engine light keeps coming on, keep getting code PO410 which reads secondary air injection system malfunction. Unfortunately I don't know what this consists of, pocket scan doesn't have definitions.
Would be grateful for helo or lead me someplace where have definitions.
Thank you.

Here's some info but no fix...

http://www.automotiveforums.com/vbulletin/showthread.php?t=689947&highlight=P0410

More info from Old Master,

http://www.automotiveforums.com/vbulletin/showthread.php?t=763519&highlight=P0410