Hah - and that's why I love this forum - two funny answers plus what seems to be the right answer.
It would make sense if it was one of the top bolts on the triangle exhaust flanges.
I broke 3 of the 4 studs off in this area when removing the exhaust, so I ground and drilled the stubs out and I replaced all four of the studs with nuts and bolts, plus I used new bolts for the top fasteners, when I put it back together.
If this was one of the top bolts, it would make sense why I have it left over and can't find any open holes anywhere.
Many thanks to all of you who replied.
Now fingers crossed my once every month or two code for the secondary air injection system goes away permanently.
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