I have a 1999 (new body style) Jetta I just had a quick question about
my check engine light. It was extremely cold here a few days ago, and
I don't think I let the car warm up enough before I took off. As such,
the car ran a little rough at first, and the check engine light came
on. I stopped, let the car idle for a bit, and since then (2 days ago)
the car has run perfectly fine - but the check engine light is still
on. I'm planning on taking it to get the codes read, but my question
is this: Does the check engine light remaining on mean there could
still be a problem? Or does the light remain on after an error code is
stored (at least until the code is cleared)?

The reason that I ask the question is that the check engine light
seemed to come on because of a specific event (starting when too
cold). Since it runs perfectly normally now - my first thought is to
get the code read / cleared, and see if the light comes back on. Does
this sound reasonable?