two mustangs

I cleared memory by disconecting battery .....then went to smog station only to have check engine light come back on 1/2 way thru test .......then the guy say,s you might need a 0,2 sensor so i did it the cheap way and only bought 1........took it back and it passed smog .....2 days later the check engine light came back on........now is it the oxegen sensor or somthing else.
please advise.

jgt58

go to advance auto or autozone , you have a OBD II port they can hook up a scanner and tell you what is wrong.

dfuny19

and they wont charge you for it either!

Crystal

Autozone did mine today for the same reason. Oxygen sensor needed replacement they said and we just bought one as well. We'll see over the weekend if it works.