Have 2003 Subaru Legacy ej25 5sp . No engine.  Installing a 2002 ej25 automatic engine in it. I know where the to big two big square white and brown connecters go , but can't find a corresponing connecter on the 02 engine for the smaller gray 6 prong connecter in the between the big white and big brown connecters in the picture

Edited January 16, 201610 yr by steve56

Front O2 sensor maybe.

Are there 6 wires going in the plug?

I was thinking it was maybe a plug for the transmission. My donor engine is out of a 2002 Legacy with automatic trans. The car its going into is a 2003 Legacy with a manual transmission. The O2s are both plugged in. Ive done manual to automatic swaps with ej22s into both automatic and manual 1996 thru 1999 Outbacks with no wiring change. Ive never swappedd an 2002 ej25 out of automatic car into a 2003 Legacy that had an ej25 with manual transmission.

 

Its a six slot connecter with two yellow, one blue/white stirpped, one orang, and two unused 

Edited January 17, 201610 yr by steve56