Did you trace the wire? Where does it go? It does look like an OBD2 plug. Possibly just an extension harness relocating the plug.
I’ve got a Y adapter for my OBD2 port so I can keep a BT dongle plugged in for data logging purposes.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |