Where is the knock sensor located on a 2004 Chevy z71 crew cab 4x4 with 5.3 motor?

The knock sensor on a 2004 Chevy Silverado 1500 Z71 (with the 5.3L engine) is typically located on the passenger side of the engine block, near the rear of the engine. It's usually near the oil filter, but not directly on it. It's a small, threaded sensor.

However, the exact position can vary slightly depending on specific engine variations. To be absolutely certain, you should:

* Consult a repair manual: A Haynes or Chilton manual specific to your year and model will have a diagram showing the exact location.

* Use a online parts diagram: Many auto parts websites (like AutoZone, Advance Auto Parts, etc.) allow you to look up parts diagrams for your specific vehicle. Search for your vehicle and look at the engine diagram. The knock sensor should be clearly labeled.

Remember to be cautious when working near the engine, as it may still be hot. Always disconnect the negative battery terminal before working on the electrical system.