Where is the 02 sensor located on a Chevy s-10 2003?

The location of the O2 sensor(s) on a 2003 Chevy S-10 depends on the engine. There's usually one or more upstream (before the catalytic converter) and one or more downstream (after the catalytic converter).

To find the exact location:

1. Identify your engine: Look for an engine code (like 2.2L, 4.3L) usually stamped on a metal plate on the engine itself or in your vehicle's documentation.

2. Consult a repair manual: A repair manual specific to your year and engine will have diagrams showing the exact location of the O2 sensors. You can find these online (e.g., Haynes, Chilton) or at auto parts stores.

3. Use an online parts diagram: Many auto parts websites (like AutoZone, Advance Auto Parts) allow you to select your vehicle's year, make, model, and engine to view diagrams showing sensor locations.

General locations (but not guaranteed for your specific engine):

* Upstream O2 sensor(s): Usually located in the exhaust manifold or very close to it.

* Downstream O2 sensor(s): Usually located after the catalytic converter in the exhaust pipe.

Important Note: Before attempting to locate or work on your O2 sensors, ensure the engine is cool to avoid burns. If you're not comfortable working on your vehicle yourself, take it to a qualified mechanic.