boostedsol

Ok, I have 2000 LS teg, w/ a drag 3. Only one o2 sensor is installed on the downpipe. I chopped the second o2 sensor and I straight piped my exhaust. I think my check engine light comes on due to the fact that im only running one sensor instead of two. Do you think that is why my check engine light goes on? Is it bad to run my car like this w/ ony one sensor connected? The car runs fine, just want to know.