I'd rather not remove the charge port door . . . here's the part of that thread that suggests I may need to:
2--remove the charge port door , 4 little screws
3--remove the big plastic covering the radiator + charge port
, need to split the cover wings around the charge port to exit charge port door inge
Those steps are to access a temperature sender under the plastic tray.
The 'barbed clip' theory is also the one I subscribe to, but (dis)proving that could lead to parts breakage, one reason I stopped in at the dealership today.
I'll play with both approaches . . . I did get a fingernail under one of the clip heads from inside the charge port, and it did seem to want to come out, but couldn't put enough force on it with fingers alone. I'll try a screwdriver next.