Sometimes the Check Engine Light illuminates because the computer detects misfires. Subaru released an improved spark plug wire set to solve the problem. The ignition coil should also be inspected for carbon tracks or short circuits between the contacts.
Problems for specific Subaru models:
Car problem reports
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Most reported Subaru problems
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.
A dead battery may be a result of the anti-lock brake system (ABS) pump continuing to run after the ignition is turned off. This is commonly caused by an ABS pump relay which has become stuck in the "on" mode. If a sticking ABS pump relay is confirmed it should be replaced. This relay is commonly found behind the passenger side head light.
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 noise in the clutch called "clutch chatter" is common if the car is driven without allowing it to warm up.
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.