Air Fuel and Oxygen Sensors - quick question

I just had to change the primary O2 on mine. You can run a test on the sensor with a multimeter. Take an ohm reading between the two black wires. Bank 1 sensor 1 on a 1gen should read between 0.8 and 1.4 ohms. My replacement one read 1.2 and the old one that was throwing the code had no continuity between them. Just a quick tip to pass on.

 

I've been searching for weeks now and this is as close an answer I can find. I keep getting that dreaded check engine light, but it cuts on and off as if feels like it. I finally caught it on the other week and the boys at Autozone read it as a "air/fuel circuit." I would assume that means air/fuel sensor, but they said maybe not. However, they couldn't offer me any other solution. I've been racking my brain, any help??