New? linear O2 sensor

[AL8001 at aol.com]

This was found in the April 99 Import Service ( a auto repair trade mag), 
page 10 top right column.
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Lexus RX300 ( car like SUV) and Toyota ES300 3.0 V6 California only cars

The most significant service-related change is the linear oxygen sensorin the 
exhaust manifold, or "air-fuel sensor" as Toyota calles it, a design that's 
also been used by Honda.  Although it looks like a conventional four wire 
sensor, it doesn't toggle within the one volt range.  Instead it produces a 
voltage that goes up in a straight line as the mixture becomes lean, within 
the 2.2-4.2 range.

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It goes on to say Toyota techs can't get a useable reading with a volt meter, 
the proper way is to read the data from the ODB II scan tool.  The photo and 
blurb state/show a 4 wire plug.

Could this be something new?  I haven't been following the UEGO/Wide band 
thread much.  From what I remember, the Honda/Horbia/NTK stuff used a 8 wire 
system.

Harold