Q: today i had a computer scan my pickup to see why the check engine light is on? on 2004 Chevrolet Silverado 1500

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It came back Knock Sensor, Knock sensor defective, check connector and wiring to sensor. So...first what is the knock sensor and what does it control? Secondly, the guy who scanned it said it could be a bad O2 sensor causing this error code. Third, how do I determine which problem it is? Forth, where is it located?
(1) Answer
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Knock sensor is mounted on the outside of the engine (side of block or center of block between cylinder heads. It measures detonation due to bad fuel or over advanced ignition timing and retards the ignition timing to prevent engine damage. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
I would test the circuit first make sure it is OK and check continuity across the sensor to see if it is shorted or open.