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CEL P0456


CAPofMD

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Got a P0456 code on a CEL that came on last night on my 2015 MKZ Hybrid.  Book says "Small evaporative leak".   Anyone seen this before?  Got a feeling it may be crud on the spring loaded

fuel fill port.  Haven't tried to clean it yet as weather sucks right now. Any ideas beside what I think ?

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3 hours ago, CAPofMD said:

Got a P0456 code on a CEL that came on last night on my 2015 MKZ Hybrid.  Book says "Small evaporative leak".   Anyone seen this before?  Got a feeling it may be crud on the spring loaded

fuel fill port.  Haven't tried to clean it yet as weather sucks right now. Any ideas beside what I think ?

H CAPofMD.  Following the instructions to clear the capless fuel system fuel port would be the first step, once the weather clears for you.  After that, some other possible causes are:

-Evaporative (evap) emission canister or fuel tank leaks.

-Evaporative (evap) emission system hose leaking.

-Fuel tank leaking.

-A small leak in any of the EVAP hoses or fuel tank hoses.

-A small leak in the purge valve or vent valve.

Hopefully one of our tech members may weigh in and be able to offer more information.

Let us know how you make out and good luck.

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Went out this AM with my code reader and turned off the CEL.  Open gas filler door and snapped the nozzle port door a few times. Drove the car to Docs appt and back (about 15 miles total) and no CEL !  Will wait and see ! ...  OH! Found out that if a CEL is on you can not use the remote start function !

Edited by CAPofMD
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After 2 days the CEL came back...looks like I'll be finding out if my 6 year CPO warranty works. It will have to wait until I get back from vacation away from winter tho. Flying to Yuma, AZ on Tuesday....  70's - 80's much better than 30's - 50's !!

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  • 3 weeks later...

Found the location and removed it. Couldn't blow thru the valve so put it back on.... code never came back. Canceled the appt with Lincoln dealer.  Maybe it was just not tightened enough...whatever no longer a problem.

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  • 3 weeks later...
  • 2 years later...

I have had the same code on mine several times. On obd-codes.com it does say that this code alone is not to be alarming. I wouldn’t and haven’t conducted a pressure test bc of a very small emissions leak. Because it does keep coming on my Lincoln service shop recommended replacing the gas door first so that’s my current plan.

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