96 Ranger, 2.3 to 2.5 swap, original manual trans. I have the grey and white connectors done, but the black one has me stumped. It is with the other two, so I was thinking it was a trans connector. I don't see any other wires from the trans, so now I'm confused. Can anyone help out?

 

O2 sensor perhaps, round with 4 wires

 

I have another problem. The front 02 sensor is unplugged, and I cannot find where it plugs into. I still have my old engine wire harness, so the next step is to go through that to see if I can find out where it is. I really don't want to drop the trans again to see about the first connector if I can help it.

 

Not for nothing but......................the upstream O2 connector and wires often end up INSIDE the bellhousing, if transmission was off

The upstream O2 connection(s) tend to be above bellhousing area in main wiring harness, and hang down enough to reach inside bellhousing and its often not seen from below as you line up and put on the transmission
So run your hand around the bell housing to make sure no wires are pinched between engine and bellhousing

And look on the main wiring harness that's on the firewall, for the upstream O2 connector

 

I have the old harness out, and laying on the ground. I see no connector for the front 02 sensor located on that side. The driver side connector that I have nothing hooked up to has the wiring colors for an 02 sensor. My 02 wiring is coiled up and rubber banded, not sure how long it's been that way, I don't remember doing it. I don't think the factory ran the wiring all the way over to the other side, but could be. If it dries up I can go to the junkyard and check. (if I can find a four banger in there) I will do a quick connect on the harness i have out, to see if they go together, but it looks like they will.

 

You can look up the part number for the 1996 2.3l upstream O2 sensor

The O2 sensor part is exactly the same upstream or downstream and for all Rangers 1986-2011

Part numbers are different to denote the Length of the lead wires attached to that O2 sensor so it can reach the plugin on the main harness connector

Upstream O2 should have a red/white wire as 1 of the 4 wires on harness
Downstream a white/black wire

 

It was for the front 02 sensor. Not sure why my wire was zip tied, but I connected it, and the heater is working, and no check engine lights. SWEET! Thanks Ron

 

Sadly, I just learned this today the hard way. I have an '06 Ranger 4x4 that I just replaced the transmission, clutch, flywheel, etc. in. Today I was finishing up by reinstalling the exhaust, and couldn't find the connector for the first O2 sensor on the passenger side. I remembered it being just above the transmission bell housing... then I felt wires going in into the bell housing. I had to pull everything out I just spend the past few days re-installing: driveshafts, transfer case, transmission,only to find the carnage pictured below.

RonD, do you have any idea what the different colored wires are for on this connector? I've been looking at replacement connectors, and they don't seem to use the same color scheme as Ford, and considering how hard it would be to correct a wiring mistake on this connector, I want to make sure I do it right the first time.

Prentice


Crushed O2 sensor on my '06 Ranger 4x4 4.0L

 

Bummer

At least you got a self adjusting pressure plate, good choice

O2 sensor connectors are universal, BUT yes you will have to wire the truck side connector up correctly

You will need to hit wrecking yard and cut off another Ford O2 sensor harness plug then splice it to your wires
Auto parts stores have them as well with wire attached you want it to match your current O2 connector, Ford did change connector type but can;t remember what year

Cut whats left of the old connector off and and pull back(cut back) the wire loom covering the 4 wires, we need to get ALL 4 Color Codes so you can splice them in correct order to new connector

If you post the color code we can post what they are and where the go
And do you think its for drivers side or passenger side O2 sensor?

 

Thanks re: the self-adjusting pressure plate. It was only a little bit more money, and it seemed worth it after spending some time researching it online. I crawled underneath my truck after work and took a few pics of the wires, so you can see for yourself. The wires are:

• Red w/ white stripe
• Blue w/ orange stripe
• White w/ blue stripe
• White w/ red stripe

Note that there was a piece of electrical tape around the end of the white w/ blue stripe wire originally, but I peeled it off to make it easier to see the colored markings of the wire in the pics.

Is there a way I can test what the wires are with a volt meter, if I connect the battery and put the key to the "on" position, without starting the engine?


Wiring of crushed O2 sensor

Same connector, different angle

 

I know it's for the passenger side O2 sensor - the first one on the exhaust before the catalytic converter.

 

Actually, looking at these pics and then looking at replacement parts online, I think I can tell the orientation of the connector, and therefore deduce how to attach a replacement, but any info you can still give me will be greatly appreciated. I don't want to screw this up!

 

For 2006

Red/white and Blue/orange are the Heater wires

Leaving grey/red and blue/grey as the sensor wires

Neither pair has a polarity, so no "order" in that respect
But for color accuracy
the blue/orange is 12v from fuse 41
sensor is grey/red is reference ground, blue/grey is signal

Check fuse 41(15amp) in engine bay fuse box, it powers the O2 heaters and may have blown if you turned on the key with connector/wires crushed

 

Thanks. I didn't turn the key at all since I started working on it. I was still re-installing the exhaust when I noticed the problem. Nice to know there's no real polarity. Another member of this forum had an extra wiring harness laying around with the same color coding, so he cut off the O2 sensor connector from there and shipped it to me today. I should have it by this weekend, so I can get back to working on my truck.

I've only been a Ranger owner for about 1.5 years, and just joined this forum a couple of days ago to get help with this specific problem, and I'm already overwhelmed by the generosity and helpfulness of everyone here. I had no idea Ranger owners would be so enthusiastic about their trucks and so helpful to strangers. Thanks again! I look forward to the day when I can help someone else. Considering how frequent people trap their O2 sensor connector in the bell housing, I may not have that long to wait!