Subaru issued a recall (WWG-90) because the mass air flow sensor has a manufacturing defect.
Problems for specific Subaru models:
Car problem reports
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Most reported Subaru problems
A rattle type noise may be noted from the tailgate area. This can commonly be repaired by modifying or changing the tailgate weather seal.
A hydraulic lifter type noise may be noted, often worse at idle. This can be caused by air being drawn past the oil pump seal allowing aerated oil to reach the valve lifters. Replacing the oil pump seals generally will correct this issue.
Premature timing belt failure is not uncommon. The recommended service interval is 60K, but belt failures before that mileage have been noted. This 1.8L engine is considered "free-wheeling", therefore the chances of valve damage if the timing belt fails is minimal.
A vibration or shutter may be noted on acceleration. If the transmission torque converter is suspected a revised part is available to correct this concern.
First the parking lights would not go off-I pulled the fuse except when I needed them. Now my emergency flashers will not go off-I have to disconnect the battery to stop them.What is wrong? My wife thinks the thing is possessed.
The air pump rusts out causing the the valves to get stuck open or closed. This appears to happen more frequently around wet areas (snow or humid). There are two valves; for the first one all you need to remove is the inter-cooler, the second valve is between the intake manifold and engine block.
At 130,000 miles, the engine began to overheat. I could smell burning oil while driving and, especially, while idling. Subaru maintenance told me I had an engine fan failure and that I had to replace both fans at a cost of $600. I refused to replace the fans at that time and took the car to a different dealership, where I was told that the fans were working fine...
...but that the head gasket was blown. Not just the head gasket either - the...
My Subaru Legacy experienced three blown wheel bearings. Each time, the car would develop a droning noise, which would get progressively louder with continued driving. A fourth was in the works when my engine blew due to a leaking head gasket. Each wheel bearing cost $450 to replace.
The front oxygen (air fuel ratio) sensor element may develop a crack, causing the Check Engine Light to illuminate. Subaru has recalled certain models to replace sensors that may fail. The Subaru service program number is WXW-80, this is not a government mandated recall.