Subaru issued a recall (WWG-90) because the mass air flow sensor has a manufacturing defect.
1995 Subaru Legacy Outback Problem Reports
RepairPal Verified 1995 Subaru Legacy Outback Problem Reports
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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.