3-wire O2 sensors

[mrvette]

o2 sensor is an o2 sensor....they allthe same...just follow the wiring
diagram...black is o2 output to computer....and varies between .1 and .9 volts
when in closed loop operation...when driving or ideling.....the heater is the
two white wires   one to ground and the other to the ignition hot +12 volts  
this is a switched lead that goes dead with ign, sw. off....obviously....I used
a chrysler o2 sensor, it's about 30 bucks cheaper than the GM unit...from Bosch
i both cases....:=)))  GENE

andy quaas wrote:
> 
> I think that I might need an O2 sensor on my truck.  I need to get a
> GM 3-wire one.  I currently have a 3-wire bosch with one black and 2
> white wires on it.  My harness has the standard GM colors.  since this
> is an aftermarket system, i can't say that i need a sensor for a 77
> GMC.  What years/vehicles would this sensor fit?  what colors should
> the wires on the O2 be?  And HOW DO I TEST MINE!!!!!!
> 
> thanks waaaay in advance,
> 
> andy
> 
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