Quote:
Originally Posted by MyTaurus8AChevy
I only saw (and replaced) two sensors. Might this be why the cars computer can't reset?
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Possibly. There should be one sensor in front of each catalytic converter and one sensor after each converter for a total of 4. It's also possible that you will have 3 sensors if your car only has one converter after the two downpipes are y-ed together. I pulled up the diagrams for a 2004 Taurus with the FFV engine since I didn't see any detail on which engine your car has. Maybe the non FFV vehicle only has a single converter? But at a minimum you're missing one of the O2 sensors.
Edit: I just checked the diagram for the gasoline engine, non-FFV 2004 Taurus and it also lists 4 O2 sensors.
-Rod