I drive a 97 civic ex. I was installing my hi-flow cat earlier today and after I took the bolts out of where the cat meets the midpipe, the exhaust fell, ripping the pins out of the o2 sensor plug. Well, since this isn't a huge deal, I looked at the plug that was still connected and saw the order in which I should put the pins back in the plug.

The problem is that there are 2 black wires on the o2 sensor. When I go to put them back in the plug, which one goes where? Thanks.

Note: This is the secondary o2 sensor that goes into the cat.