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O2 sensor connections

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WayneTab

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Discussion starter · #1 ·
2004 5.7 Limited.
Struggling with a O2 sensor.
The connector on the car side has come away from the wires.
Really awful place to get to.
I can buy a new connector with leads from Rockauto.
Where do the leads connect?
O2 sensor lead and connector, plugs into connector from car, what and where is the next connection?
Tried using crimps to connect but getting no voltage
Image
 
Discussion starter · #3 ·
No, lol. Maybe I’m not explaining correctly?
The connector on the engine side has pulled out. It’s impossible to reach and try to reset the pins.
I was trying to ask where is the next connection. Looks like I can buy the cables and new connector from Rockauto but where does it connect?
Does this make sense?
Thanks again 👍
 
Discussion starter · #5 ·
wannaeatyourbrains said:
Mate, from memory the next connection is the big one for the entire transmission/oxygen sensor harness. It is hard to deal with it while the transmission is in, but you can lower it a bit on the jack by undoing the transmission mount. That might help.
Click to expand...
Do you know it’s location? Is it on top? Would I access it from above or below?
I know it’s going to be a real pain.
The cat is starting to smell.
 
#6 · (Edited)
Yeah you can see it if you pull the intake manifold off and look behind the motor, I recall. On top of the transmission. No changing that harness unless you drop the transmission a bit, but. The leads are plugged into the transmission with push clip fasteners in quite a few places too.

This is considering yours is the same as mine. Remember, mine is 2009, and as I was inspecting a 2004 the other day I found they are quite a different car.

Anyway, my story is I saw all that harness when the transmission was out. And I tried to pull the harness out once when it was in, but my very best efforts were to no avail. But you can undo the transmission mount bracing and lower the transmission some, I reckon, which might see you right. If that was me, I would mind what was going on at the front of the motor with the fan and radiator hoses and stuff, plus the intake manifold at the back there, as I lowered the back of the tranny down a bit.

Which oxygen sensor plug is buggered? Upstream or downstream? Cause in mine, when I lie under the car, I can reach up and disconnect the downstream wire from the transmission where it is attached a couple of places with the push pins, and then that wire comes right down where I can have at it.

That upstream one, it does not drop down much at all, and it would be a tricky business changing a plug on it.

I see a couple of videos on YouTube about transmission removal and replacement for 2004, and you might get some clues if you watch through them.

Another workaround would be to wire that 02 sensor straight to the computer with a new wire.
 
#8 · (Edited)
You can look at a diagram of a 4 pin 02 sensor to see what you need to do with each wire.

The computer in mine is next to the battery. You pull out the cowl and this water bucket thing and you have free access.

But here's the rub. The way I find where the signal wire goes to the computer is I unplug the computer, and then I attach a wire to the positive battery terminal one end and put a straightened paperclip (for plug sockets) or small alligator clip (for pins and bare wires) on the other. I use that to send 12 volts up the signal wire from the oxygen sensor end, and I use my test light to find which plug socket it is coming out at at the computer end.

Like, once you unplug the computer, you just got a wire going from the plug to the oxygen sensor, and if you make that one live you can soon find out which one it is - which one sends the signal to the computer. You ground your test light and just touch the sockets one by one in the plug attaches to the computer until it lights up. Then you know the one to splice into.

But that necessitates you be able to reach whatever wires you got hanging down next to the transmission well enough to find the signal wire and attach an alligator clip and send the current up it.

Which if you can reach them for that, would probably allow you to attach an additional bit of wire to make them a bit longer so you got something to work with, right? To attach your new plug.

In your predicament, the independent circuit idea probably requires you to have a wiring diagram, I guess.

I am sorry to hear your struggles, by the way. Bloody thing.
 
Discussion starter · #9 ·
wannaeatyourbrains said:
You can look at a diagram of a 4 pin 02 sensor to see what you need to do with each wire.

The computer in mine is next to the battery. You pull out the cowl and this water bucket thing and you have free access.

But here's the rub. The way I find where the signal wire goes to the computer is I unplug the computer, and then I attach a wire to the positive battery terminal one end and put a straightened paperclip (for plug sockets) or small alligator clip (for pins and bare wires) on the other. I use that to send 12 volts up the signal wire from the oxygen sensor end, and I use my test light to find which plug socket it is coming out at at the computer end.

Like, once you unplug the computer, you just got a wire going from the plug to the oxygen sensor, and if you make that one live you can soon find out which one it is - which one sends the signal to the computer. You ground your test light and just touch the sockets one by one in the plug attaches to the computer until it lights up. Then you know the one to splice into.

But that necessitates you be able to reach whatever wires you got hanging down next to the transmission well enough to find the signal wire and attach an alligator clip and send the current up it.

Which if you can reach them for that, would probably allow you to attach an additional bit of wire to make them a bit longer so you got something to work with, right? To attach your new plug.

In your predicament, the independent circuit idea probably requires you to have a wiring diagram, I guess.

I am sorry to hear your struggles, by the way. Bloody thing.
Click to expand...
Big thanks again for your support. It will be early next week before I attempt your suggestions.
I have prop shaft bearings arriving next Tuesday for my Freelander.
I always want to keep one car running.
 
Discussion starter · #14 ·
WayneTab said:
I did wonder that I had damaged the O2 sensor by swoping the connections.
problem is I am working by trial and error as cannot see the original colours.
Click to expand...
I decided to remove the 2/1 sensor then swop them over to determine if the sensor is working?
Passenger side sensor is a real PITA to disconnect. I can see the connector but cannot get to it properly. Looks like I will be cutting the wires.
Hopefully then I can swop 1/1 and 2/1
then determine if it’s a cable or sensor issue.
Here goes………..
 
Discussion starter · #16 ·
Another day, same shit.
I can’t remove the passenger side O2 sensor. To tight and poor access.
Broke a ratchet and a socket!
Have ordered new O2 sensors and when they arrive I will have to try and remove the exhaust 😱.
 
#17 · (Edited)
Drill a new hole and weld a bung onto it then extend your wires.
 
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