I change my spark plugs like a week ago at home and now a week later. I got a check engine light come on. I went to autozone, so they can pull the code and the code said "system 2 too lean" I am thinking can it be my O2 sensor??? someone please help.

 

Go back and redo the step to make sure you didn't forget something or do something different on the reassemble.

 

I look online and I hear that its common for the o2 sensor to go bad on these cars.

 

Have you got the spark plugs gapped correctly?

That's the first thing i'd check.