Check Engine Light Due to Failed Knock Sensor on 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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Average mileage: 84,566 (30,000–128,700)
Engine affected: 2.5L 4 Cylinder Turbo
7 model years affected: 2004, 2005, 2006, 2007, more2008, 2009, 2010
10 people reported this problem
2 people shared problem details
2008 Subaru Impreza WRX- 2.5L 4 Cylinder Turbo30,000
Sensor replaced approximately every six months since 30,000 miles. Maintain General maintenance. Getting very frustrated with Subaru!
2008 Subaru Impreza WRX- 2.5L 4 Cylinder Turbo128,700
I just bought a used 2008 WRX, just a couple hours later the engine light came on with a misfire code. Went back to the dealer, they replaced the spark plugs & coils, and checked everything out. Two days later another engine light with a O2 sensor, bank 1. They cleared the code, asked me to drive again. Four days later engine light on again after I pushed the car high speed on the highway. Autozone told me, O2 sensor again - but then the light went off by itself. I'm very confused - does the car have a problem or not?
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