To the best of my knowledge there is no O2 relay. Why would you think one is needed?
The 2007 Subaru Outback has 16 valves.
The 2007 Subaru Outback is a gas-powered vehicle.
The 2007 Subaru Outback has a 5-speed manual.
The 2007 Subaru Outback has a flat 4 engine.
The height of the 2007 Subaru Outback is 5 ft. 3.2 in. (63.2 in.).
The curb weight of the 2007 Subaru Outback is 3330 lbs..
The 2007 Subaru Outback is 15 ft. 8.7 in. (188.7 in.) long.
The 2007 Subaru Outback's turning circle is 35.4 ft..
The 2007 Subaru Outback runs on regular unleaded.
The 2007 Subaru Outback has single overhead cam (SOHC).
The 2007 Subaru Outback has 54.4 in. of front shoulder room.
The 2007 Subaru Outback has 51.0 in. of front hip room.