i have a '95 Century,
may not have anything to do with it,
but, when mine comes on,
it has already turned on the fan from sitting
still for a while or in slow slow traffic,
where the air is not being blown into
the air intake thing under the hood,
then after mine goes through another
"cycle" of turning the fan on and off,
doesn't take too long at all,
and the light goes off......that is what mine does.
It's not the Check Engine Light.
The light is not on at the present time and the bulb is good.
Just wondering what it monitors that's all.
"The service vehichle soon light will come on if you have certain
non-emissions related vehicle problems.
These problems may not be obvious and may affect vehicle performance or
I can't verify all the things it monitors, but on my '01 Pontiac, it
does at least monitor the exterior lights. So, as a starting point,
look for a bulb out.
My car has the OBD1 system and when my telltale light comes on, it is
always an EGR complaint. There is nothing wrong with my EGR system, so
I started monitoring the gas brand I am using when the light
illuminates. I've found that using gas with Techron (sp?) doesn't cause
the light to come on. You might try checking for trouble codes and use
that info to track down and intermittent problems.
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