What is the sparkplug gap for a 2004 subaru outback 2.5 liter with california emissions?

SOURCE: what oil grade do i need in 2002 subaru outback?

Probably 5w40 synthetic

SOURCE: Replacing a/c hoses in Subaru Outback 2004

give this website a try its about A/C-repair www.directgardening.com

SOURCE: 1997 subaru legacy 2.5 emission code P0170 fuel

If I am correct the po170 code is a lean condition. Usually this is caused by a cracked air duct leading to the air filter. Or the air filter box is not secured properly. I work in the service department at subaru and when we do big services we dont get the air box on right and customers return with a check engine light with the same code and we always find that the air box is not secured. This does not mean this is the issue, for a fuel trim code could be other issues, but I would definately look at this first before getting into a/f sensors, converters and all those other expensove items.

SOURCE: check engine light is on. What could be wrong?

02 sensor =oxygen sensor or low fluid levels such as oil antifreeze or just routine maintenance as well ,if you inspect the motor area and find nothing wrong its most likely emissions again a sensor however merely disconnecting the negative terminal on the battery for a few minutes and then reconnect should turn the light off however the fact still remains that maintenance checkup should be in order as this is only a temporary fix as it will come on again until checked out { Auto-zone or Midas } will do a diagnostic check if the check engine light is on usually for free and tell you exactly what is the reason for it being on ..i hope this helps ...

SOURCE: #3 cylinder miss in a 1997 subaru outback 2.5

Do a cylinder compression test.