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I believe the sensor is the same on all non-lean burn engines. It's the wide-band for lean burn engines which is really expensive.
My understanding of how it works (and someone correct me if I'm wrong) is that the upstream and downstream O2 sensors just check each other to see that they agree, in a car without lean burn. It's basically either a "yes" or a "no" as to whether or not the air fuel ratio is right, they can't determine what the exact AFR is. If one sensor goes bad or drifts, the two disagree and you get a CEL.
I'm seeing the replacement part as being about $18 on RockAuto, vs ~$130 for a wide band on engines that can do lean burn.
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