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.
Engine Misfire Due to Failed Spark Plug Wires on Subaru Impreza WRX STI
Average mileage: 95,000 (95,000–95,000)
Engine affected: 2.5L 4 Cylinder Turbo
8 people reported this problem
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I replaced all 4 spark plugs but still getting a misfire code for cylinder 1. Tried swapping the coil packs but still remains on cylinder 1.