* Upstream Sensor (Sensor 1): Located in the exhaust manifold, relatively close to the engine. It's before the catalytic converter.
* Downstream Sensor (Sensor 2): Located in the exhaust pipe, after the catalytic converter.
Finding them precisely requires looking under the car, likely near the exhaust manifold and further down the exhaust system. A repair manual specific to your year and engine would give you the best diagrams and precise locations. You can also find diagrams online, but use caution as they may not be perfectly accurate for your specific model. Always double check your sensor before replacing it.
