Hi everyone, I am looking for a way to convert from a one wire to a three wire O2 sensor for my brothers '91 with an LO5. I'm not sure where to start on this one.
Any help is appreciated.
Thanks!

 

The only difference between a one-wire and three-wire O2 sensor is that the three-wire has a heating element. You can trigger off the fuel pump circuit if you wish, by adding a $12 relay from NAPA that routes battery power to the O2 heater whenever the fuel pump circuit goes active.

 

That may work
The heater was what I was going for.
So pretty much, splice the sensor wires toghether and hook the other two to a battery source?

Thanks for the help

 

One wire is for the O2 sensor output. The remaining two wires are for power and ground. I dont think it matters which one is which, so long as you get the O2 signal wire correct.