I think the front one is bank 0 .... the one in front of the cat adjusts fuel ... the one after is the only one that would measure the efficiency of the cat. I guess you replaced both of them from the sound of it. The Bentley only says replace catalyst for that one. So if it isn't the cat, you may have contaminated the sensor when you put it in. How many miles are on the car? And don't look at the dealer for a replacement, at least until you have found a few that are cheaper.
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