I don't think there is a cap for the obd socket, I don't have one on my V70 and my previous V70 didn't have one either. Think they just leave it open for easy access.
Can't help with the other part sorry.
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2003 V70 D5 [163] SE - Sold at 188,000 miles.
2011 V70 D5 [215] Rdesign - currently owned.
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