Update:
The P0455 code did resurface... I believe within a week oof my last post. I'd been sitting on diagnosing/repairing it because:
1. Smog isn't due until next July.
2. I'm a procrastinator.
I had removed the wheell liner, and a visual inspection revealed nothing. So, I sat on it.
However, a couple weeks ago I was thinking, "I put on a new Porsche cap... code remained. What if there's a leak at the TOP of the filler tube?"
There is a rubber seal that sits just below the top of the filler tube, and mine seems a little loose, kinda just hanging there... never thought much of it. Anyhow... station nozzle stresses the filler tube (a little)... maybe it is "off" just enough that a new cap wouldn't fix the code. So...
I took some Gorilla Tape (~3/4 - 1 inch wide and gave it one wrap around thhe top of the filler tube. The top of the tape stting just level with the top of the tube. Screw back on the cap... clear the code and... 2 weeks later and at least 20 start/stop/drive cycles later... the code has not returned.
So... then I'm thinking that there light be some sort of sseal/gaasket/part that I'm missing and I start poking around. Here are a couple/few I pulled up... and wondr if soomeone might chime in on which route I should take.
https://www.pelicanparts.com/More_Info/99720194400OEM.htm?pn=997-201-944-00-OEM&bt=Y&fs=0&SVSVSI=986M
https://www.eurospares.com/Parts/191201557/Porsche?pi=28780
https://www.pelicanparts.com/More_Info/99620175300.htm?pn=996-201-753-00-OEM
If these are the wrong parts... what would be the correct part, if one exists? For now I'm going to stick with the tape and... I may remove it for a while to see if the code resurfaces.
Any advice appreciated. Thanks!
