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Message: <blockquote data-quote="Iceman12" data-source="post: 18830" data-attributes="member: 8087">My car does that too, although it now spends more time with the light off than on anymore. From what I've seen it has a lot to do withe th temp and humidity on my car. When it gets real hot out my car tends to run a lil rich, so the CPU notices it has no cats, but for example: if I drive to my friends house when it is real hot and humid and the light comes on, if i hang out there till it gets dark and cool, and the car completely cooled down, (when temp goes back below 160 the CPU will take another look at O2 data and re-decide if it will use it, MIL light on = not using O2 data), once the car warms back up ususally the light will go off again. So with a lil planing I can now pretty much keep the MIL light of all the time, which at least on my car makes it run a lot better.</blockquote>