Hi, and welcome to Just Answer!
The code indicates that the oxygen sensor is sending a rich (or to be more technically correct a low oxygen) signal to the engine controller that it's unable to compensate for by adjusting fuel delivery.
Any problem that causes the car to be rich can trip this code.
Without access to a scan tool to display live data and verify sensor readings, the best place to start in my opinion would be the oxygen sensor itself. They are really a tune-up part in my opinion and should be replaced on a regular basis anyway, just to maintain engine performance and economy. I do not however care for the 'universal' wire it yourself type that many parts stores sell, often times they cause more trouble than they are worth..
The sensor in question is of course the one that's more harder to get to, it's the one located in the exhaust manifold, just before the flange for the catalytic converter.
I hope this helps, if you need more information, or have more questions, please don't hesitate to reply back and ask!Thanks,Leo
I'm confused now.... we are talking about a 3.8 caravan right? It should only have one upstream and one downstream O2 sensor. If your scan tool is showing 4, are you sure it's not displaying them backwards? I'd unplug the downstream and see what value changes..
What are your current long and short term adaptives?
Can you get the freeze frame info?