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Where is the knock sensor located on a 2004 Chevy 5.3 liter 1500 4 wheel drive?

The knock sensor on a 2004 Chevy 5.3L 1500 4x4 is typically located on the passenger side of the engine block, near the rear (firewall side). It's usually mounted fairly low on the block.

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

* Consult a repair manual: A Haynes or Chilton manual specific to your vehicle year and engine will provide a diagram showing the precise location.

* Use a parts diagram: Many online parts stores (like AutoZone, Advance Auto Parts, etc.) allow you to look up parts diagrams for your specific vehicle. Find the knock sensor in the diagram.

Looking at diagrams and using the above information as a starting point will give you the best chance of finding it quickly. Remember to be careful when working near hot engine components.