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1989 Mustang 5.0 GT O2 sensor wiring harness help needed

10836 Views 4 Replies 3 Participants Last post by  Marunos
We've picked up a 1989 Mustang with a 5.0L engine and 5-speed transmission. Unfortunately, there's no wiring harness from the oxygen sensors into the main harness. We need the 8-pin connector schematic for how it connects into the main harness.

We've been scouring forums and all we've been able to find is the EEC pin-out diagram.

Does anyone have the schematic or know where we can find one? Maybe someone has a picture of the connector showing the wiring configuration?

Any help is GREATLY appreciated!
1 - 2 of 5 Posts
Mustang FAQ - Wiring, Engine, Air Bag, ABS Home Page has the diagram you are looking for.

Welcome to the forum! :)
I am pretty sure you'll find a pin-out for the HEGO harness at that link I gave, and be able to match up wire colors with the main harness plug.

The easiest way is to just buy a new HEGO harness. Then you don't have to think at all. :) Just plug and go. You can get one cheap at a U-Pull-It yard.
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