Where are the oxygen sensors and how do you replace them on a 2004 cavalier?
There will be either 2 or 3 oxygen sensors. One sensor is in the header and one (or two) are “Post” catalytic converter. Most of the late model Ford V6 engines contain 3 sensors. These are screwed into the header and into you exaust pipe. This is a very easy and quick project. All of the sensors should be easy to locate. They stick out of you header and exaust pipe about 1.5 – 2 inchs. Just unscrew, unsnap from the wire harness and reverse this process with the new sensors. You should unconnect the battery during this process, this will also reset you check engine light. Goodluck.
