Originally Posted by sheeRXhilir8tion

So you haven't deleted the pump and it's somewhat functional but not entirely hence the DTC and that's why you've masked it?

Your key-on theory sounds plausible. I can't really test it on that car because the pump is disconnected but I just got another '8 and the air pump is going. Will mask it and see how this one behaves then let you know if it does the same thing as yours.