Where is the O2 sensor for 2004 Chevrolet Silverado 2500?

The 2004 Chevrolet Silverado 2500 has multiple O2 sensors. Their exact location depends on the engine type (gasoline or diesel) and whether it's a pre-catalytic converter (upstream) or post-catalytic converter (downstream) sensor.

To find them, you'll need to consult a repair manual specific to your truck's engine. These manuals will show diagrams with the exact location of each sensor. You can find these manuals online (often as PDFs) or at auto parts stores.

Generally speaking, you'll find O2 sensors:

* Upstream (pre-cat): These are usually located in the exhaust manifold, close to the engine.

* Downstream (post-cat): These are located after the catalytic converter, in the exhaust pipe.

Without knowing your specific engine (e.g., 4.8L, 5.3L, 6.0L gasoline, or a Duramax diesel), a precise location cannot be given. Looking at diagrams in a repair manual is crucial for accurate identification.