Subaru issued a recall (WWG-90) because the mass air flow sensor has a manufacturing defect.
Problems for specific Subaru Legacy years:
Car problem reports
Problem with your car? See what our experts say or submit your own.
Repairpal verified Subaru Legacy problems
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.
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.
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.
A failure in the anti-lock brake system (ABS) causes the ABS pump to continuously run, which will eventually wear down the battery. An improved ABS relay is available to solve the problem.