My light went on awhile back and Autozone reset it saying it pulled an o2 code....two questions 1) it hasnt gone on since and my car is running the same is it necessary to fix it still? and 2) will my car pass inspection this month if it IS gone??

 

I dunno how it is in MA, but in OH you'll fail if you have a CEL

I had a car pass once .. 2 bad o2 sensors and a clogged cat. I 'accidentally' stalled it pulling it into the testing center, to clear the CEL (didn't come on till after it was running for a few minutes). Passed w/ no problem.