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Where is bank 1 sensor 3 on your 1996 Chevy silverado?

A 1996 Chevy Silverado doesn't have a "Bank 1 Sensor 3." Oxygen sensors (O2 sensors) in that era typically only had a sensor before and after the catalytic converter. Therefore, there's no third sensor in Bank 1 (or Bank 2 for that matter). You might be misinterpreting a diagnostic trouble code (DTC) or a parts diagram.

To figure out what sensor is actually needed, you'll need to:

* Get the exact diagnostic trouble code (DTC): This code will tell you precisely which sensor is malfunctioning.

* Consult a repair manual: A Haynes or Chilton manual specific to your 1996 Chevy Silverado's engine (e.g., 4.3L, 5.0L, 5.7L) will show the location of all the oxygen sensors.

* Use a wiring diagram: This will show the sensor's location relative to the wiring harness.

Without the DTC or a specific sensor number from your repair manual, determining the location of a non-existent "Bank 1 Sensor 3" is impossible.