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CEL codes PO441, PO455, PO456

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Old 03-24-2014, 12:50 AM
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Default CEL codes PO441, PO455, PO456

My check engine light came on, so I went to the local auto parts store to have them run the codes, they came back with the ones listed in the thread title. I'm posting it here because a quick google search showed they were all associated with the EVAP line, valve, etc or the gas cap.

Since my car is beyond the factory warranty, where can I go to get these cleared or should I actually find out if it's more serious than the gas cap?

Thanks all!

- Tony
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Old 03-24-2014, 02:40 AM
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Gas cap doesn't seal properly. Anyone with Scangauge can clear it for you.
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Old 03-25-2014, 10:09 PM
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Originally Posted by ESEMRFOZZ13
Gas cap doesn't seal properly. Anyone with Scangauge can clear it for you.
What is Scangauge? What makes you so sure it's just the gas cap and not something else?
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Old 06-10-2014, 05:24 PM
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Red face Help! CEL codes 0441, 0455, 0456 - Already replaced gas cap

Bump....My 2008 tc (46k) ran the same three codes. I replaced the gas cap but did not reset the light (don't know how/scared to disconnect battery/was hoping it would reset itself to confirm fix).

Now my gas mileage seems crazy low. I looked under the hood for ton hoses but don't really know what to look for/where to look. I'm nervous to bring it to a shop who will try to rip me off.

Any help here? Pics or descriptions of what to look for and where would be super helpful
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Old 06-28-2014, 07:33 AM
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I had same issues with the code. I replaced cap. and the code kept returning. Turns out the evap carbon canister needs to be replaced and it even better the purge valve needs to be replaced too because the canister had been so far gone.
I have read that it could be covered under a warranty and maybe beyond because it is an emissions issue caused by a faulty part.
I am beyond my warranty now (I have an 04XA). I hear it's easy to replace but I am having a hard time finding any vids or diagrams on how to do the replacement myself.
You cannot tell that the canister is faulty just by looking at it. The issues seem to be internal. It is caused by water leaking into the canister.
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