Quote:
Originally Posted by Masher
Here's a pic for the backside of the bolt.
There's no washer it's part of the bolt, it was found in the engine bay on the side, must have been left there?
It could be from downpipes like in the pic actually. The o2 sensors are pretty large.
Prolly not a drain plug since the bottom is clean? No o-ring found.
Bought downpipes at n54tuning 6+ yearss ago, unbranded but prolly vrsf tbh. So that lines up with it being the older vrsf that had this. There is hope 
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If you had downpipes installed the mechanic probably dropped the plug when he was installing the O2 sensors you're just discovering it now. I wouldn't worry about it.