or maybe 100 or so other reason that can turn a mile light on. That's why
you need to post the fault codes, and I bet it's not the O2 sensors. "the
car ran a little rough at first"... my money is you have a few misfire
faults and if that's the case the MIL will turn itself off in a few more
days.



"al" > wrote in message
.. .
> saxman wrote:
>
>> 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?
> Pobably the oxygen sensor getting tired...no matter the outside
> temperature.