Hey guys, just a quick question. My check engine light comes on every now and then for about 5 -10 seconds. Could that be my O2 sensor? I bought it with a rebuilt motor, do you think they ever changed it? I know if the O2 sensor is bad, it will set a code but usually when an 02 goes out, does it keep the light on, or does it do what mine does? How much are they?