I have a '96 Subaru Legacy Outback(Wagon), automatic transmission, 2.5L engine. I've had the P0400 code being thrown for about 2 1/2 months now. Cleaned and tested EGR valve, and that's properly functioning. I checked the vacuum lines and they're all good as well. From what I've read, this is a fairly common problem with Gen.1 Subaru cars. Any other suggestions for me? Driving to and from Bethlehem from Quakertown every day for school is killing me on gas with the code having defaulted the fuel mixture now. Also, could this have any relation to loss of braking pressure? Thanks in advance! Any and all help is appreciated!