* Upstream O2 Sensor: Located in the exhaust manifold, before the catalytic converter. This sensor is closer to the engine.
* Downstream O2 Sensor: Located in the exhaust pipe, after the catalytic converter. This sensor is further down the exhaust system.
Finding the exact location on your specific Tahoe requires looking under the vehicle. The upstream sensor is usually easier to spot because it’s in a more accessible location, but both are generally near the exhaust manifold and catalytic converter. A repair manual specific to your year and engine will give you precise diagrams. You can find these manuals online or at auto parts stores.
