All of a sudden I've got codes..
 

I had my O2's and EGR tuned out with HP Tuners four years ago after installing lt's and the ory. The other day the SES light came on so I stopped into Advance Auto to have them scan it. It came up with ten codes! They were O2 and EGR codes, I don't remember the specifics but my question is, why would they pop up all of a sudden? Thanks for any insight.