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O2 (Oxygen) Sensor - Service Engine Soon Light on 2006 Nissan Sentra

The Service Engine Soon light has come on. I was told this was due to my O2 sensor, however the last car mechanic I spoke to said this could be due to bad gas. I have had the light cleared, but it has come back on within a few times of driving.

I just hit 40k miles and the car has sat for long periods without being driven (now I am trying to be better about driving it at least 1x week).

It is unusual to have to replace the O2 sensor with this low of mileage? I am wondering if something else is the matter.

Asked by for the 2006 Nissan Sentra
Really need to KNOW the exact code number, then we can help you. There are hundreds of codes. It could be a code for a bad gas cap and not have anything to do with the oxygen sensor.
2011 nissan sentra 2.0 p0420