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Old 04-07-2009, 08:35 PM   #11 (permalink)
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Did you reset the code? From my experience with other Fords, the gas cap light can come on if you just go to the gas station once and forget to tighten the cap down... My mom had a 2001 Explorer, and the "Check Gage" light would come on if the cap wasn't on correctly...

Once it's on though, it takes a while to clear in the system even after the problem is fixed... I would definately clear the code first and then see if it comes back... When I bought a Stant InstaFill cap for my Taurus, the SES light (before there was a dedicated gas cap light) came on and the code was for low gas tank pressure or whatever it was (I forget the exact wording)... That's what the garage where I bought it from told me anyways. After that I went against their advice and kept using the Stant cap. The light came on again and after a couple weeks, it cleared itself and I haven't had the light come on for that reason again...

I think in some cases it can be a pretty fickle light and I wouldn't neccessarily run out to buy a new gas cap... That's just my opinion though!

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Old 04-07-2009, 09:13 PM   #12 (permalink)
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Doesn't the Gen 3 still have a threaded gas cap? The G4 has a cap that latches instead of threading in - usually if the gas cap light on a G4 is coming on, the cap needs to be replaced.

If it's significantly cheaper than the dealer, I wouldn't worry too much about trying the newest junkyard cap you can find.
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Old 04-07-2009, 09:18 PM   #13 (permalink)
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QUOTE (ford_ses @ Apr 7 2009, 09:13 PM)
Quote:
Doesn't the Gen 3 still have a threaded gas cap? The G4 has a cap that latches instead of threading in - usually if the gas cap light on a G4 is coming on, the cap needs to be replaced.

If it's significantly cheaper than the dealer, I wouldn't worry too much about trying the newest junkyard cap you can find.[/b]
G3 has the latch where you screw till it snaps in place
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Old 04-07-2009, 09:22 PM   #14 (permalink)
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Ah - the G4 doesn't screw in. It turns maybe a quarter turn and latches...I've only put gas in a G3 once and I don't remember what it was like
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Old 04-07-2009, 10:02 PM   #15 (permalink)
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QUOTE (ford_ses @ Apr 7 2009, 09:22 PM)
Quote:
Ah - the G4 doesn't screw in. It turns maybe a quarter turn and latches...I've only put gas in a G3 once and I don't remember what it was like [/b]
My G3 turns a quarter turn then latches as well...
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Old 04-07-2009, 11:49 PM   #16 (permalink)
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The emission codes take quite a while to reset on their own unless the ambient conditions are just right. I would get a new cap not worth the trouble for a JY one.
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Old 04-16-2009, 06:15 PM   #17 (permalink)
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Well i got the new gas cap, and reset the light.

today the light comes back on, i get the code pulled
and the guy tells me P0457 missing, loose, or defective cap.

what are the odds it's the gas cap again?

any other things to look for.
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Old 04-16-2009, 06:18 PM   #18 (permalink)
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It's funny because I had my SES light come on this week for a P0442 which is the gas cap/emissions system leak code... It's my InStant fuel cap though... I just reset the code and it hasn't come back!
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Old 04-16-2009, 07:37 PM   #19 (permalink)
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Just yesterday Nidan gave a succinct description of the workings, post #3 of this thread: http://taurusclub.com/forum/index.php?showtopic=68999

But I can't find anything in my 04 manual for P0457 (but I don't have the power control / emissions manual). I'd think a biggish vacuum or air leak in the fuel system, equivalent to a missing cap, would result in strong gas fumes.

The pressure sensor itself is somewhere in the evap system above the gas tank. Maybe the sensor is failing?
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Old 04-28-2009, 09:18 AM   #20 (permalink)
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I need some more help.

I went under the car and took down that black platic box under the trunk.
full of sand and twigs, and i made sure all the hoses were attached and not cracked and
all looked fine.

The only hose i could not check was going upto the filler neck.
how do i check that?
are there any other things to check?
could the new gas cap be defective?

BTW How can my entire car underneath have no rust but it's all on my rear quarter panel.
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