* Upstream Sensor(s): This is the most critical sensor. Its location varies slightly depending on the specific engine (3.3L, 3.8L), but it's generally located in the exhaust manifold or very close to it. You'll likely find it on one of the exhaust pipes, near the engine.
* Downstream Sensor(s): These monitor the efficiency of the catalytic converter. They are usually located further down the exhaust system, after the catalytic converter(s). There might be one or even two downstream sensors.
To find them, you will likely need to:
1. Consult your owner's manual: The manual may have a diagram showing the sensor locations.
2. Use a repair manual: A repair manual specific to your 2004 Dodge Caravan (with the correct engine size) will have detailed diagrams and instructions. Haynes and Chilton are popular brands.
3. Use an online parts diagram: Many auto parts websites (like AutoZone, Advance Auto Parts, etc.) allow you to look up diagrams based on your vehicle's year, make, model, and engine. This can help visually locate the sensors.
Important Note: Because of the heat involved, oxygen sensors can be very hot. Allow the engine to cool completely before attempting to locate or replace them. Wear appropriate safety gear, including gloves.
