plugged cat or torque converter?
Try swapping your rear O2s. If the code still comes up on the pass side, then it's your cat. But if it jumps over to the driver side, then it's the sensor.
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I had gotten this code about a year ago, but had it cleared and it never came back.
I guess that is warning sign #1.
My guess is that something gunky got knocked loose and clogged that cat. My idle was becoming a little erratic, and kinda high.
I would clear the code, and it would come back later in the day.
I swapped O2 sensors to make sure it wasn't a faulty sensor, and it was definately the Cat.
I was sitting at 78,500 miles so I took it to the dealer right away, and it got replaced for free.
The car is running perfectly normal now, the idle issue is gone.


