Our CE light comes on when the O2 sensor gets wet.
We generally make it a priority to take care of the CE light immediately, since it indicates an emissions fault. But considering that it seems to work fine when it's dry - and that the exhaust heat keeps it dry unless we're driving in snow or deep puddles - we're choosing to ignore this one for the time being.
DH is talking about a new car. I am totally not ready for one yet. He grew up in a self-made family where waste seemed to be a way of proving to themselves that they were no longer struggling. I've been working on bringing him 'round to my family's way of thinking 
Speed comes from what you put behind you. - Judi Ketteler