Quote:
Originally Posted by Ghoulish Delight
The measurements that trigger the check engine light (well, one of the measurements, there's a whole litany of conditions that trigger it) are averages of readings taken each time you start your car. So it takes a start-up or two for the light to trigger if, say, your gas cap is loose, and it takes a start-up or two for it to go away once you fix the problem (unless someone goes in and manually resets it).
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Okay, this makes total sense. Just further illustrates how little I really know about car maintenance. But, that's what I pay the mechanic for. All I can handle is making sure I change the oil every 3k miles and check the tires. Leave them to check the fluids, belts and everything else.