Generally, you'll find them in the exhaust system downstream of the catalytic converter(s). However, some models might have a pre-cat sensor as well (before the catalytic converter). These are usually threaded into the exhaust manifold or pipe.
To find the O2 sensors on YOUR 1993 Chevy, you need to:
1. Identify your engine: Find the engine displacement (e.g., 3.1L, 4.3L, 5.7L, etc.) and engine code (often found on a sticker under the hood or in the owner's manual).
2. Consult a repair manual: A Chilton's or Haynes repair manual specific to your year, make, and model will show you diagrams of the exhaust system and the precise location of the O2 sensors. These manuals are readily available online and at auto parts stores.
3. Use an online parts diagram: Many auto parts websites (like AutoZone, Advance Auto Parts, etc.) let you enter your vehicle's information and view diagrams showing the sensor locations.
Without knowing the specific model and engine, I cannot provide a definitive answer. Providing that information will allow for a much more accurate response.
