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["Thomas C. Meggs" <tom AT plik.net>]

Right, the owners manual for my car actually talks about it. It says if 
the check engine light comes on, the first thing you should do is make 
sure the gas cap is on securely. If you go for a drive and it is still 
on, you need to get it serviced.

Regards,
Tom

childers.paula AT epamail.epa.gov wrote:
> the "gas cap loose" thing happened to our car last year. amazingly, it
> is legitimate. i don't remember exactly, but it was something about the
> fuel/air mixture in the pressurized system (almost all newer cars have a
> pressurized fuel system) was off.   for us, it was not a loose gas cap,
> but an overpressurization after we allowed the tank to get v-e-r-y empty
> and then filled it to the brim on a hot day.  check your owner's manual,
> as it may have a recommendation for how to resolve the issue without
> diagnostic/$$$.  our manual had step-by-step instructions for getting
> the light to go back out.  i would imagine a web search would turn up
> similar stuff.   of course, if you follow those instructions and the
> light is still on, and then you try that battery trick and the light is
> still on, then you gotta problem.
>
>
>
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