Most likely locations:
* Upstream (Pre-catalyst): This is the more common location to find the sensor, which is usually before the catalytic converter. You'll likely find it in the exhaust manifold, close to the engine block. Expect it to be screwed into the exhaust pipe.
* Downstream (Post-catalyst): There might also be a second oxygen sensor after the catalytic converter. This sensor monitors the efficiency of the catalytic converter itself. It's also usually in the exhaust pipe, but further down the exhaust system than the upstream sensor.
To find it with certainty:
1. Consult a Repair Manual: A repair manual specific to your 2001 Chevrolet S10 2.2L will show you a diagram with the exact location of the oxygen sensor(s). This is the most reliable method.
2. Visual Inspection: With the engine cool, carefully look underneath your vehicle, following the exhaust manifold and pipes. The sensor will look like a threaded cylindrical part with a wire harness connected to it.
3. Online Resources: Websites and forums dedicated to Chevrolet S10s might have pictures or discussions on oxygen sensor locations for the 2.2L engine. Search for "2001 Chevrolet S10 2.2L oxygen sensor location" on a search engine.
Caution: Exhaust systems get very hot. Always allow the engine to cool completely before working near the exhaust system to avoid burns.
