Car Problem Reports

Subaru Impreza WRX Check Engine Light Due to Failed Knock Sensor

Subaru Impreza WRX Problem
9 Reports
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Model Years Affected: 2004, 2005, 2006, 2007, 2008, 2009, 2010

Engine Affected: 2.5L 4 Cylinder Turbo

Average Mileage: 111,850 mi (95,000 mi - 128,700 mi)


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.

  • Visitor, , 2.5L 4 Cylinder Turbo, 128,700 mi

    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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