I'm not sure what you mean by "trigger the sensor to operate".
  I believe that the ECU decides when to pay attention to the O2 signal
based on info from Temp sensor II.
Heating the O2 sensor is not going to influence that.
If the engine is not running at the proper temperature, solve that
problem (thermostat?).
  Of course a bad temp sensor or wiring can also mislead the computer.
If the engine gets hot and the computer realizes it, but the O2 sensor
is not producing a reasonable signal, there may be a problem with the
exhaust that keeps it from heating up, assuming the sensor is OK and the
engine is not running lean for some reason.

Larry A.

Greenamyer, William L wrote:

>On oxygen sensors, I am looking at changing my 1984GL sensor over to a
>heated sensor. Anyone got a part number and wiring for this? I am
>guessing it will end up being a 2 or 3 wire assembly (rather than the
>present single wire setup) but some of those existing 2 and 3 wire
>assemblies don't have the heater. I need a heated sensor. For some
>reason, my van just doesn't seem to consistantely get hot enough
>(especially at idle) to get up to temperature to trigger the sensor to
>operate.
>
>William
>
>
>