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2009 Subaru Impreza WRX STI Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2009 Subaru Impreza WRX STI

2009 Subaru Impreza WRX STI Problems

The Check Engine Light may illuminate because of a failed knock sensor. Although the sensor often tests okay, it can fail intermittently, while the vehicle is being driven.

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.

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