Need a little help with My O2 sensors. I went to get BR's O2 fix to get rid of my SES light, and I noticed the bung on the rear of the exhuast was plugged (purchased the car used a while back.) I looked around and found one plugged into my O2 housing and one on my downpipe where it looks as if someone added a bung there (no the best looking weld job.)

I have an AEM wideband with the Air/fule gauge, and thought that is what the O2 sensor in my O2 housing was for??? Did they just move the secondary O2 to the down pipe? The car is lowered on Tien S techs and I saw a post a few minutes ago where someone was worried they would damage theirs'. Maybe the previous owner was too????

Any advice would be greatly appreciated, thanks!