[Diy_efi] 4-wire O2 identification

[Bernd Felsche]

Peter Foote tapped away at the keyboard with:

> Can a GM AFS-105 4-wire O2 sensor be used as a replacement for a
> 1-wire O2 sensor? Do all GM's use NB sensors?

A 4-wire sensor has 2 wires for the cell and 2 wires for the
heater. A 1-wire sensor has 1 wire for the cell and uses the metal
in the exhaust, studs, nuts and head for the other cell terminal.

The heated sensor must have heater current; some (most?) NB sensors
have internal switching (bi-metal) so they switch off the heater
when it's warm enough.

In theory you could connect one heater terminal to ignition-on
circuit, the other to the block; and one of the cell terminals to
the block as well.

But DO check if the heater switches itself off.

-- 
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