Where is the O2 bank one sensor two located on a 2000 Chevy silverado 5.3 liter v8?

There isn't a standardized location for an O2 sensor labeled "one sensor two" across all 2000 Chevy Silverado 5.3L V8s. The naming convention varies depending on the specific engine configuration and the scan tool being used. The location of the O2 sensors is usually described as "upstream" (before the catalytic converter) and "downstream" (after the catalytic converter), and often as bank 1 (passenger side) and bank 2 (driver's side).

To find your "O2 sensor one sensor two" (assuming this refers to a downstream sensor on the passenger side), you'll need to:

1. Consult a Repair Manual: A repair manual specific to your 2000 Chevy Silverado 5.3L V8 will have a diagram showing the exact location of all O2 sensors. This is the most reliable method.

2. Use a Diagnostic Scanner: A good OBD-II scanner can show you a sensor ID number that corresponds to a physical sensor location. The sensor's location may be displayed visually or numerically.

3. Visual Inspection: With the vehicle safely elevated, you can carefully look at the exhaust manifold and the catalytic converter(s). The downstream sensors are usually closer to the catalytic converter than the upstream sensors. Be careful as the exhaust system will be hot if the engine has been running recently.

Without a repair manual or diagnostic scanner, pinpointing the exact location of a sensor based on an ambiguous name like "one sensor two" is unreliable and potentially dangerous. You could accidentally damage other components while searching. Use the above methods to find the proper sensor location.