* 2.2L Engine: The upstream O2 sensor is typically located in the exhaust manifold, near the engine. The downstream sensor is located in the exhaust pipe, after the catalytic converter. Getting a precise location without a repair manual and specific engine code is difficult.
* 2.4L Engine: Similar to the 2.2L, the upstream sensor is usually in the exhaust manifold, close to the engine, while the downstream sensor is in the exhaust pipe after the catalytic converter. Again, a repair manual specific to your engine code would give the most accurate position.
To find it yourself:
1. Consult a repair manual: This is the best way to pinpoint the exact location for your specific Cavalier model and engine. A Haynes or Chilton manual will be extremely helpful.
2. Look under the car: With the engine cool, carefully look along the exhaust system, near the engine and after the catalytic converter for a threaded sensor. It will have a wire leading to it.
3. Use a diagram: Many online auto parts stores (like AutoZone, Advance Auto Parts, etc.) will allow you to look up diagrams based on your year, make, model, and engine. This might show you the sensor's location.
Caution: Exhaust systems get very hot. Allow the car to cool completely before attempting to locate the O2 sensor.
