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I have a RMM DP and it has a bung for the second o2 sensor. The first o2 sensor is actually in the manifold right before the DP bolts up, and the second one is about half way down the DP. I have a 95 so I'm not too sure about the OBDII but I think when it notices that both o2 sensors are giving the same reading it knows that the cat is gone, but is you use the "random" simulator the reading is different so it thinks everything is ok.
 
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