heated O2 sensor circuit question

[Shannen Durphey]

Don't know what you're driving, but I mounted the O2 sensor in my
pickup in the base of the LH collector, and it doesn't seem to fall
out of closed loop at the stoplights.

To answer your question, the GM sensors were wired to key on power,
and you need to make sure that the exhaust system is grounded to the
block if there isn't an exclusive heater ground.
Shannen

diy_efi at efi332.eng.ohio-state.edu wrote:
> 
> I plan on relocating my O2 sensor further down into the header since the
> original spot reads off only 2 of the 4 cylinders. Thing is, the
> original sensor is a single wire, and I think I'd need a heated one for
> the new location.
> Any idea how to wire the heater circuit? Is it safe to wire the circuit
> to a switched (engine on) power source or was the heaer designed to shut
> off once it reaches operating temp?
> 
> -Ed