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Hi,
I hooked up a digital OBD2 tool, and discovered the code for the
problem;

P0456 - Evaporative Emission Control System Leak Detected (very small
leak)

The red led comes on, and it will not let me erase the code so that the
engine light goes out.

As the dealer said the the gas cap was loose, this would have been a
P0457, which it is not.

I have filled up with fuel since the light came on, and have ensured
that the gas cap is indeed on correctly.

Joe

Ray O wrote:[color=blue]
> <jcaverly@sympatico.ca> wrote in message
> news:1162510745.257120.5970@e3g2000cwe.googlegroups.com...[color=green]
> > Hi,
> > We purchased a 2007 Yaris hatchback on August 25, 2006.
> >
> > Mileage has been in the 38 to 41 mpg range.
> >
> > We are presently at 2,996 km on the vehicle.
> >
> > Filled up the vehicle two days ago.
> >
> > No problems with the vehicle, but today the engine light came on
> > while driving home from work.
> >
> > Called the dealer, who said that the gas cap was not on correctly.
> > Turned the gas cap, and it clicked. Dealer said the engine light will
> > reset itself in a couple of days.
> >
> > All fluid levels are okay.
> >
> > Has anyone else had this problem on such a young vehicle?
> >
> > Thanks,
> >
> > Joe
> > Ontario, Canada
> >[/color]
>
> The problem is not with the vehicle, it is with whoever filled up with gas.
> The gas cap should be tightened until you hear it click several times or you
> can get a check engine light. Loose gas caps are probably the leading cause
> of check engine lights on new vehicles because people miss the part in the
> owner's manual about properly tightening the gas cap and miss the
> instructions on the gas cap itself to tighten until you hear it click
> several times. I think a lot of people worry about breaking something or
> over-tightening the cap but the clicking you are hearing is normal and does
> not mean that the cap is over-tightened.
>
> The gas tank is designed to prevent gasoline vapor from escaping into the
> atmosphere. The computer checks whether the gas tank is sealed tight by
> letting a vacuum build in the tank. If it won't hold a vacuum then the
> computer will turn on the check engine light.
> --
>
> Ray O
> (correct punctuation to reply)[/color]