2005 Cadillac STS Q&A

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

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? -
Answer 1
A trouble code would be much more helpful. -