You have a leak in the gas cap, or the gas cap is missing.

0442 = Evaporative Emission Control System Leak Detected (small leak)
0455 = Evaporative Emission Control System Leak Detected (gross leak)


I would not even consider the cause for the 442, and focus my attention on
the 455. After all, a small leak is only a small leak until it is a big
leak, but a big leak is a small leak in the beginning. My guess is that your
cap is not being put on well, or it has a diaphram of sorts inside that is
failing or has failed. either way, you need a gas cap. If you have a locking
gas cap, take it off and leave it at home for a couple of weeks while you
use the factory gas cap, or any other gas cap for that matter. Clear the
code and replace the cap, and see if the code comes back. I don't think it
will, and then you can spend the Family Fortune, or your kid's college fund,
and buy a new locking gas cap.





"JELo" > wrote in message
...
> Okay, so warranty expired a few months back
> and now I start getting the dreaded P0442 and
> P0455 MIL errors (small and large leaks in the
> evap emissions system). I have reset the
> computer several times and they keep coming
> back - no other errors though.
>
> So I want to start by replacing the gas cap as
> some have suggested elsewhere. Local dealership
> (the only one for 150 miles in any direction) wants
> $20 and they would have to order it! Is there
> anywhere online I can get a factory gas cap for
> a reasonable price?
>
> What other things should I be checking related
> to these codes?
>
> Any ideas greatly appreciated . . . JELo
>
>