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 contactsGoogle+
Car Problem Reports
Subaru Forester Improved Spark Plug Wires for Misfire Issues
Subaru Forester Problem
Engines Affected: 2.5L 4 Cylinder, 2.5L 4 Cylinder Turbo
Average Mileage: 70,816 mi (40,869 mi - 100,000 mi)
Visitor, 2004 Subaru Forester, 2.5L 4 Cylinder Turbo, 90,350 mi
Engine started to stutter at idle last night. After 5 min, it was fine and running perfectly. Next day, ran perfectly for 15 min, then started to stutter when idling. Check engine light and cruise control light are on now. Never had a problem with this car before.
Visitor, 2005 Subaru Forester, 2.5L 4 Cylinder, 59,000 mi
Stalls after a rain. Rough idle and operation until engine compartment is dry.
Visitor, 2007 Subaru Forester
The check engine light illuminated and another dash light blinked continuously. I took it in to my mechanic, who said the wires and seals had to be replaced ($380). My friend had the same lights go off less than a week later and the Subaru dealer told her it was the catalytic converter.
Visitor, 2009 Subaru Forester, 2.5L 4 Cylinder, 85,600 mi
When at a redlight (2x's, car started shaking (Saturday, April 12th). Notice engine light flick on/off the second time. So I put it in park and tapped gas until light changed on my way to Subaru car service. Yesterday was told the ignition coils eed to be replaced.
Visitor, 2009 Subaru Forester, 2.5L 4 Cylinder, 68,000 mi
Misfire on Cylinder 2 & 4. Replace Spark plug wires but still misfire code. Replace engine coil and misfire code went away.
Visitor, 2010 Subaru Forester, 2.5L 4 Cylinder, 90,000 mi
rough idle and check engine light after rain . Dealer says needs new wires and ignition coil.
Visitor, 2009 Subaru Forester, 2.5L 4 Cylinder, 52,350 mi
Check engine light flashing, then going off. Eventually CEL stayed on. Diagnosed bad plug wires. They were just changed 1 year ago at 30,000 miles too. We'll see if thats the end of it.
Visitor, 2005 Subaru Forester, 2.5L 4 Cylinder, 40,869 mi
month ago, check engine and cruise lights on. subaru rec check gas cap. took it off and put back on. prob persisted.
3 days later, subaru svc could find no prob even tho the check eng came back as misfire. yesterday, car was dif to start and when put in gear, stalled. did not start after that. towed to subaru. result, ignition coil towers cracked and ignition wires burnt at coil. replaced. works fine.