I'm get check engine "code 1" Oxygen Content. I know it's not my Primary 02sensor b/c I just bought It last month. What else can It be, any suggestion would be great please.

 

Is possible that i got this code b/c last week while putting on my tranny/shiftlinkage I was taking off the exhaust and I forgot to unplug the secondary oxygen sensor, so when I pulled out the exhaust it pulled the wiring right out of the connector, the sencond oxygen sensor came out whole, but it took the wiring harness connector with it leaving just the wires, I guessed and put them back in, If someone could check for me or snap a pic or something I would greatly appreciated it.