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2005 Cadillac STS Question: Are the Knock sensor and Oxygen sensor the same thing?

 

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PattySH, 4.6L V8, Huntington Beach, CA, June 03, 2012, 16:26
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I was told I need a Knock Sensor. When I went to look it up, all I find is the Mass airflow and Oxygen sensor. I know its not the Mass airflow, so what is it?

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