2009 gs se5 check engine on after instal of tricled help!

[Claire]

Hey. I just had tricled drl installed on 2009 gs se5. Everything works good. But now check engine is coming on.

I attached a pic of a plug we found in area under coolant reservoir. Does it look familiar to anyone? We dont think it was attached it was tucked in the frame. Mods have been done to this bike before me since I discovered a sway bar.

Any ideas about this plug? I'd be very grateful. We disconnected battery waiting 30 mins to see if that helps.

Thanks!