2006 Subaru Impreza WRX STI Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2006 Subaru Impreza WRX STI
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2006 Subaru Impreza WRX STI ProblemsCheck Engine Light Due to Failed Knock Sensor
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.