Subaru issued a recall (WWG-90) because the mass air flow sensor has a manufacturing defect.
Problems for specific Subaru Impreza Outback years:
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Repairpal verified Subaru Impreza Outback problems
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.
There have been reports of "clutch chatter," particularly when driving the vehicle from a cold start. If the issue was reported by the owner while the vehicle was still under warranty, the dealer may replace the clutch with improved parts.
The leak may develop from the oil pump seal. Our technicians prefer to use thread locker when replacing the seal to prevent the bolts from becoming loose again.
A noise in the clutch called "clutch chatter" is common if the car is driven without allowing it to warm up.