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Problems for specific Subaru Impreza WRX years:

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Most reported 2009 Subaru Impreza WRX problems

 

Verified for the Subaru Impreza WRX

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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Verified for the Subaru Impreza WRX

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.

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