With all the talk about generic O2 sensors, maybe someone can answer
something that has been puzzling me for quite a while.

Are O2 sensors calibrated to give different response curves?

How do we know that the Ford  O2 sensor is the same calibration as the
Vanagon sensor, only with a different plug?  Maybe someone decided years
ago that these two sensors look alike and so they must be the same,
except for the wiring.  Does anybody have any real data that indicates
these are identical or at least similar in response?

Does anyone know of a reference for the performance calibration of O2
sensors?  I've read many of the Bosch Fuel Injection books available and
while they describe how FI systems use an asymmetrical oscillation
pattern to shift mixture ratios, they don't address the differences in
O2 sensors.  Certainly with all the different part number O2 sensors
produced, there must be differences other than the type of plugs or
heaters.

Thanks,
Ed McLean