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Yes. BMW sometimes calls it a "pre-catalyst" it seems--or at least some of its aftermarket followers are selling items they are calling a pre-cat. But some of the Hyundai literature calls the second catalyst a "secondary" unit and it has no sensors monitoring it. So there could be a variety of ways automakers are doing this.
I have not been successful finding really reliable sources via google (like from the automakers or SAE or something).
Anyone have citations from reliable sources? I am so far failing. Suggestions for databases to search?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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