I need to wire up an Afr gauge so I need to pass the wiring from a newly installed wideband sensor into the cab of my 1998 4runner. Does anyone know where the existing o2 sensor wires enter the vehicle? I'd like to take the same path but pass a wire from inside to out to fish the wires / connects in.

 

They make there way into the ECM from the main Engine harness just below the wiper motor

 

So they run under the body and up the firewall?

 

Pretty much

They are bundled with the transmission and transfer case sensors and switches

 

Excellent! Thanks for the help!!

 

What have you done that you need an AFR gaguge? Let me see :-)