Where is the oxygen sensor located on a 2000 Chevrolet Cavalier?

The oxygen sensor(s) on a 2000 Chevrolet Cavalier are typically located in the exhaust manifold, before the catalytic converter. There's usually one upstream (before the catalytic converter) and one downstream (after the catalytic converter).

However, without knowing the exact engine (2.2L, 2.4L) and configuration, pinpointing the *precise* location is difficult. A repair manual specific to your Cavalier's year and engine is the best resource for exact placement. You can often find these manuals online (in PDF form) or at auto parts stores.

Look for a wire harness leading to a sensor screwed into the exhaust manifold. It's usually a threaded cylindrical sensor, often with a single wire (for a heated sensor, which is more common on a 2000 Cavalier) or several wires. Be cautious when looking for it, as the exhaust manifold will be hot if the engine has recently been running.