Mustang FAQ - Wiring, Engine, Air Bag, ABS Home Page has the diagram you are looking for.
Welcome to the forum!
Welcome to the forum!
1989 Mustang 5.0 GT O2 sensor wiring harness help needed
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!
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 - 5 of 5 Posts
Thanks for the info!
I can see the wire colors used in the Mustang Main Harness for connector #40 as shown here. I also see connector #42 shown here in the HEGO O2 harness. The colors
Maybe this is a stupid question but how do I know which color goes to which pin in the connector as it plugs into the main harness? I guess I'm thinking that I need to pull back the casing on the main harness to see what color wires on that side and then match up the wires so that when the male/female ends are plugged in that they line up?
I can see the wire colors used in the Mustang Main Harness for connector #40 as shown here. I also see connector #42 shown here in the HEGO O2 harness. The colors
Maybe this is a stupid question but how do I know which color goes to which pin in the connector as it plugs into the main harness? I guess I'm thinking that I need to pull back the casing on the main harness to see what color wires on that side and then match up the wires so that when the male/female ends are plugged in that they line up?
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.
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.
PLEASE PLEASE PLEASE make sure that your pins from your main harness are in match with pins from O2 sensors harness. If you fail to do so , your computer will be toast right with car start.
Read this thread:
RPM Rising to 3K after Installing New O2 Sensors!!! Please Help - Mustang Forums at StangNet
Read this thread:
RPM Rising to 3K after Installing New O2 Sensors!!! Please Help - Mustang Forums at StangNet
1 - 5 of 5 Posts
- This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Ford Mustang Forum
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more!
Full Forum Listing
Explore Our Forums
Top Contributors this Month
View All
Cobrajet67
297 Replies
Forddenial
163 Replies
my89foxbody
108 Replies
Recommended Communities
Join now to ask and comment!
