Jared_blown5.0

First off i have a 94 mustang gt, and i got a autometer air fuel ratio gaue. It says to splice into the sensor signal wire. My question is which one out of the 4 is the signal wire. The colors of the wires are red, black, gray&yellow, and gray. Which is the signal, Thanks in advance guys.

Joel5.0

LH side O2 signal = Red/Blk
RH side O2 signal = Gry/Lt Blu

Check ECM pins 43 & 44 of this diagram. Hope this helps.

Jared_blown5.0

thanks but i am looking at the left side out of the harness, and there is no red/black wire. There is a red, a black, a gray, and a green yellow??

Joel5.0

Typical Ford's diagrams snafu.....check the wires at the O2 sensor side....you should have 2 white wires, 1 black and one gray....mate the black wire from the O2 side to the wire on the harness side....that's the signal wire....at either side. GL