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"Bonehenge" <DwightSchrute@DunderMifflin.com> wrote in message
news:arosk2ldk2tsbo6k4j1iln4uhenu7vg1co@4ax.com...[color=blue]
> On Sun, 5 Nov 2006 13:21:19 -0600, "Ray O"
> <rokigawaATtristarassociatesDOTcom> wrote:
>[color=green]
>>
>>In the factory repair manual Toyota lists possible causes in order of
>>likelihood, and loose gas cap is listed first.
>>
>>A gas cap that is not quite tight enough might trigger DTC P0456, while a
>>cap that is off or very loose would cause P0457.
>>
>>In any event, if the gas cap is tightened enough so that you hear it
>>clicking or ratcheting several times, the check engine light should turn
>>itself off. If there is a leak in the evaporative emissions control
>>system,
>>the check engine light will remain illuminated.[/color]
>
> This isn't limited to Toyota.
>
> I work for a company with a large (50,000+) fleet. This same
> "problem" shows up on GM, Ford, and Chrysler vehicles.
>
> I'd trust the dealer, tighten the cap, and get on with life.[/color]

The Society of Automotive Engineers (SAE) has standardized trouble codes and
their possible causes for the OBD II system. For most trouble codes, no
matter which automaker, the cause will be the same.
--

Ray O
(correct punctuation to reply)