Sorry to piggyback on your question, John, but how about the opposite?
Can a 3 wire 02 sensor be used on a 1.9 engine by running a 12 volts to
one of the white wires and grounding the other?

Perhaps the answer(s) to both will enhance understanding.

Mike

John Rodgers wrote:
> Can the one wire version be used on a 2.1L engine?
> If not, why not??
> If so, what is lost without the other two wires.
>
> My newly installed  3-wire O2 sensor apparently has an internal fault.
>
> I have a brand-new-in-the-box 1-wire O2 sensor.
>
> Thanks,
>
> John Rodgers
> 88 GL Driver
>