Two problems related to gas recirculation valve (egr valve) have been reported for the 2001 Subaru Outback. The most recently reported issues are listed below.
In 20 degree weather (fahrenheit) an overwhelming gasoline odor filled the cabin of my 2001 Subaru legacy wagon (outback). This happened on three different trips around town yesterday. I have a 2. 5l engine, using 87 octane gasoline. The check engine light did not eliminate during these episodes. I lifted the engine compartment hood when this happened a third time and found the vapor smell was strongest near the intake manifold. There was no evidence of fuel leaking from any neoprene of steel lines. Obviously the odor was coming from the engine compartment through the heating system vents (the climate control fan was turned to high). The odor was so strong, it was overwhelming even when the vents were blowing recirculated air from the beginning of the trip. I believe a spark could have easily resulted in an explosion.
2001 Subaru Outback leaks fuel in cold weather. Read on the web about hundreds of owners with this complaint. Live in massachusetts and when the weather gets below about 25 degrees fuel smell fills the passenger cabin. Appears to come from under the engine manifold. Hope to not pass out from fuel vapors. Haven't had a fire yet. 2nd issue is head gasket leak which was a $1500 repair. Also appears to be a common issue with Subaru.