my check engine light came on a few weeks ago. i figured it was the 02 censor so i had the code thrown at auto zone and it was, today i replaced the 02 censor (before cat per code) and then i disconnected the battery to reset conputer and code. i waited about 10min reconnected the battery and started her up and the light was gone. i drove 5miles down the road and it reappeard whats the dea??