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Old 06-17-2013, 04:32 PM   #1
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CEL P0456

Evaporative Emission Control System Leak Detected (Very

Small Leak).

Has anyone else had this problem?

Last edited by Carwhisperer; 06-18-2013 at 06:49 PM.
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Old 06-17-2013, 05:57 PM   #2
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Tighten your gas cap. Sounds silly, but that's usually all that will be.
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Old 06-17-2013, 05:59 PM   #3
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Probably gas cap?
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Old 06-17-2013, 06:12 PM   #4
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^^^^X3

Yup, I've seen this code before and all that needed to be done was retighten the gas cap to make it go away...
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Old 06-17-2013, 06:28 PM   #5
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I made sure it was tight, reset the code and drove it around, no cel yet. But, I was curious and loosened up the cap and drove it again and no CEL popped up. I'm going to drive it around tomorrow and see if it'll pop up again with the cap loose.
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Old 06-18-2013, 06:16 PM   #6
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So today I got the exact same CEL again after work right when I started up the car. Its not my gas cap. Its tight. I drove home and I went through almost 2x as much gas as I normally do ( 12 mile commute ) and went through almost a gallon of gas. I've had DI seal issues in the past. Wondering if this is related. Nothing is leaking to the ground which is worrysome.
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Old 06-18-2013, 06:19 PM   #7
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Anyone get P0451 codes?
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Old 06-18-2013, 06:52 PM   #8
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Well the easy solution isn't the answer this time...

On my stepmom's bmw it was a $1,000 repair to make this cel go away...

Time for another dealer/warranty visit
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Old 06-18-2013, 06:55 PM   #9
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awesome..
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Old 06-18-2013, 07:44 PM   #10
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Check any vacuum lines. Last time I had that code it was due to a pinched vacuum hose line after installing a cai. Different car though.
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Old 06-18-2013, 08:12 PM   #11
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Check any vacuum lines. Last time I had that code it was due to a pinched vacuum hose line after installing a cai. Different car though.
I do have a perrin CAI, ill check around again.
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Old 06-18-2013, 10:31 PM   #12
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My engine has been lifted out 2 times for DI seal replacements. Would that have anything to do with a possible vacuum hose line if it was related to how the mechanic put it back in?
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Old 07-08-2013, 09:52 PM   #13
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Originally Posted by 86_ZN6 View Post
Anyone get P0451 codes?
Did figure this out
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Old 07-08-2013, 10:19 PM   #14
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Did figure this out
do you have this CEL? are you with FI?
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