code says it's a knock sensor

2004 GMC SIERRA
127,000 MILES
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I recharged the k&n filter on my 2004 gmc sierra and the check engine light came on. The code says it's a knock sensor. Is there an easy solution?
Sep 4, 2012 at 9:36 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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