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You have the manifold, then an oxygen sensor, then the cat, then a second sensor, and then the muffler. You need that first sensor for the car to run properly. The second sensor is there for the EPA and has nothing to do with performance. The second sensor talks to the first sensor to determine if the cat is working. ROW cars do not have the second sensor.
If you do not have the second sensor hooked up then you get a check engine light because the DME thinks the cat is bad. But this is the funny part. You can have the second sensor hooked up to the electrical connector, but the sensor not screwed into the exhaust stream. You get fault codes but no check engine light. I ran my car this way for a while, in the interest of Boxstir science of course.
What I am about ready to do is to reprogram my 2.5 DME as a ROW car. Then the DME will not be looking for a second sensor after the cat. In the interest of science of course....
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