Code P0040?

The car listed above is a Coupe Base model.

This car also had a Multiple Misfire Code, But Cylinder # 1 Appeared more than once on the scanner, so I replaced that coil, and that stopped the multiple misfire stuff, now I'm just reading P0040. The person I got the car from (2 weeks ago) informed me that he already replaced the oxygen sensors when this happened. I took the splash guard plastics off of the bottom, I can see the 4 Connectors for all the 02 sensors, I unclipped each one, inspected the pins, I blew out the female sides with a spritz of canned air. You can tell by the way they are routed that they aren't crossed. I don't even think they'd make it to connect from one bank to another. Both Cats are operating at normal temperatures. I have no idea where to go from here. Let me know any information you need I'll reply with it ASAP! Thanks so much In Advance!