fuel cap seal/o-ring?
 

is there a replacement fuel cap seal available? I am only seeing the $30+ replacement fuel cap. certainly there's an o-ring available, no? anybody got a part number?

REALOEM doesn't appear to show anything...

Is it double lip or just o-ring?

I did not find a seal available separately.

You could try flipping the seal over so the new surface seals better. For bonus points, some Permatex UltraBlack on the back side (formerly the front side, before th flip) to fill in any cracks might help too.

I've done that sort of repair on many seals when it is not sold individually, or when I need an immediate fix.

Check this on ebay.
232639754603

might have to try the permatex solution. I checked out the promising ebay part but the shipping is...wait for it...$31.50! lol! but I don't think that's the biggest issue, which was the fact that my year is not listed among the compatible models.

yeah I saw that one too. cross references with this
https://www.autohausaz.com/pn/16116756772

but that says doesn't fit my 2005.

it is this available for diy?

I bought the whole fuel cap via Amazon worked great


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andrew which cap? did you buy oem or one of the aftermarket? frankly, while I am waiting, the doubled over plastic grocery bag seal cleared up the code and is handling the challenge just fine. although somehow it is probably not safe or something like that.

I know $35 isn't the end of the world but I guarantee this is one of those situations where I am going to be tempted to not throw away the old part simply because there is really nothing wrong with it and it is Genuine BMW. it's a weird thing with me....like getting rid of control arms when the bushings go, lol! if you don't though, you'll end up with your own junkyard, right in the garage.