Intermittent P0442 error code after vehicle already fixed for same code.

BobZombie12B to Mechanic Advice@gearhead.townEnglish · 1 year ago

So, I have a 2016 ford mustang EcoBoost that recently had a p0442 code. Took it to the dealer and they told me it was the fuel filler neck (the door inside had become bent so I was able to limp it for a bit by putting duct tape over the fuel port). I ordered the part online (OEM) and had the part installed by another shop (good reviews and seemed professional enough on inspection) because dealer was too much. Got it back and the thing drove perfectly. I also checked and I saw that the permanent code has disappeared, so we were good. Welp about a few days later the CEL appeared, and it is the same code. On a whim, I reset the code and performed a drive cycle. I checked afterward and it said all of my I/M systems were good including my evap. Well now the CEL is back on, and I am at a loss.

Does anyone have any ideas on what could be causing this code so strangely?

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