hey fellas, this has been a on going problem. about six months ago the engine check light so i went to the shop and they said it was the o2 sensor so i changed it. Every thing was fine for a while then the light came on, but only for like 30 seconds. Then two to three months later it came on again for a minute. Then five months later it came on for one minute or so. i took it to the mechanic but he said it has to be on to check it. yeah right,it turns off by the time I take it. So do you fellas know what could be the problem? the only thing I could think of is a loose wire.