Contour Enthusiasts Group Archives Forums General Troubleshooting Broke a Tube

I just finished my UIM/LIM cleaning/rebuild today, and as I was fiddling with something JUST BEFORE planning to do the first start up, my clumsy hands had to snap one of the two tubes at the top of the UIM. I know one of them is for the brake-boost, but I broke the other one beside it. I taped off one end to the UIM to avoid a vacuum leak, and the other end of the tube to prevent sucking in unfiltered air. What my question is, what the hell does this tube lead to? My car is running awesome after the rebuild, but im wondering why I dont have any problems. My check engine light, however, did come back. Luckily no more codes for running to lean (knock on wood), but the three codes I do have is po420 (oxygen sensor bank 2 being replaced this week anyways), another code was for my TSS (also being done this week), and the last one was EGR Flow Insufficient. I am very doubtful my egr valve is out, and i know it isnt clogged because I just cleaned those passages.

So my main question is, does that broken tube lead to something that has to do with the EGR?