Here is a picture location of the oxygen sensors. Let me know if you have questions. Thanks
Ok the mass airflow sensor is not an oxygen sensor. Here is a picture location of the oxygen sensor. If you can go to autozone again and have the code checked again I can tell you if thats a problem for sure. Its an expensive sensor to THINK that might be the problem and replace. But here are replacement instructions, let me know if you have questions. You can reply to this answer at anytime even after you accept, thanks.