i recently did the tb bypass and egr trim freemods. today i noticed the ses light. would it cause it to come on?

 

you probly didn't get the egr tube back in properly and that causing the code not the t/b by pass. try taking the tube back off and then putting it back on and get the seal in there tight its a b!tch but can be done.

 

did you remove the throttlebody? if you did, make sure you plugged everything back up on it, and check to make sure there isn't any leaking from around the EGR where it goes into the manifold. i had trouble getting mine to not leak a while back. other than that i have no idea what it could be