Ok check this out.. Went to DMV for some paperwork. After DMV, went to get something to eat and a couple of minutes later, the check engine light went off.... Parked in the lot and diagnosed a Code 1 again. Picked up some food to eat and right when I started the car, no MIL. Drove to work, and 2 min later, yap you guessed it, Check E Light. And again, Primary 02 Sensor. Left work, started my car, and again no MIL in sight. Drove home and so far, no thrown code..... Now that I've thrown a code without my AF gauge.. I am now wondering what the problem could be? Any thoughts or ideas? I still have to check my AF this weekend and also use my friend's A/F, but now since I've thrown a code, I am now suspecting that it could be ECU related. Anyone??