[Phreaksangel]

So I have a 2006 jeep grand cherokee laredo 3.7. Wiring for the O2 sensor (bank 1, sensor 2 I believe) was damaged (not the O2 sensor itself but from the wiring harness) and I've looked for hours to try to find the correct colors on it with no luck. Couldn't find a replacement connector either. Ended up just ordering an extension and using that for a replacement but of course the wires are different colors and I'm not sure which ones go with which. Replacement wires are red, black, yellow, and white. Any ideas so I can get back on the road?! Thanks!

 

[jtec]

the o2 sensor should just plug in, you should not do any wiring.
you should ONLY use NTK brand sensors. Others esp the wire yourself are problematic.

Anyway

 

[Phreaksangel]

the o2 sensor should just plug in, you should not do any wiring.
you should ONLY use NTK brand sensors. Others esp the wire yourself are problematic.

Anyway

I appreciate your reply. When the guy was changing them out he notified me that the wires we damaged (possibly just old wiring is my guess) and they weren't even connected to the connector itself. As I didn't have a way to replace the connector to reconnect my new O2 i had had leave it as is.. So unfortunately, I have to rewire a new connector into my harness and since I wasn't able to find an actual replacement part, I had to use an extension with the same type of connector, but of course the wiring on the extension itself is not the same as the original wiring for the Jeep. I just want to make sure it's done right because I can't drive it without it unplugged, as it severly affects the driving performance.

 

[nwoods]

There are usually four sensors, can't you compare with another similar harness elsewhere in the system?

 

[brent_m]

Is the wiring damaged between the sensor and the connector? Or is it damaged beyond the connector, what I would call the "harness" as it ties into the rest of the jeeps wiring looms.

The photograph of the connector looks like the receiver side of the O2 sensor, which would connect to the larger "harness".

 

[Phreaksangel]

There are usually four sensors, can't you compare with another similar harness elsewhere in the system?

Yes, however with using a connector with different color codes, I want to make sure they're all connected to the correct ones.

 

[Phreaksangel]

Is the wiring damaged between the sensor and the connector? Or is it damaged beyond the connector, what I would call the "harness" as it ties into the rest of the jeeps wiring looms.

The photograph of the connector looks like the receiver side of the O2 sensor, which would connect to the larger "harness".

Is the wiring damaged between the sensor and the connector? Or is it damaged beyond the connector, what I would call the "harness" as it ties into the rest of the jeeps wiring looms.

The photograph of the connector looks like the receiver side of the O2 sensor, which would connect to the larger "harness".

The O2 sensor itself is brand new. The damage is above the connector on the wiring harness side. Since there is little to no wire sticking out of the broken connector itself, it makes it difficult to determine which one went where. And due to using a different colored connector, I want to ensure I know exactly which wire does what so I'm not cross wiring anything.

 

[brent_m]

The O2 sensor itself is brand new. The damage is above the connector on the wiring harness side. Since there is little to no wire sticking out of the broken connector itself, it makes it difficult to determine which one went where. And due to using a different colored connector, I want to ensure I know exactly which wire does what so I'm not cross wiring anything.

Even on the OEM O2 sensor, it doesn't appear that the wires follow the same color codes from harness to O2 sensor.

Looking at the schematic posted by @jtec - here's what I see.

Right side
Brown/Gray to Black/Light Green
Brown to Dark Blue/White

Left side
Dark Blue/Yellow to Dark Blue/White
Brown/Orange to Black/Light Green

Everything on the right side of "to" is the O2 sensor. You might need to open up the O2 sensor protective covering to reveal the colors.

How are you going to splice these wires? Using those crimps and heat shrink?

 

[Phreaksangel]

Even on the OEM O2 sensor, it doesn't appear that the wires follow the same color codes from harness to O2 sensor.

Looking at the schematic posted by @jtec - here's what I see.

Right side
Brown/Gray to Black/Light Green
Brown to Dark Blue/White

Left side
Dark Blue/Yellow to Dark Blue/White
Brown/Orange to Black/Light Green

Everything on the right side of "to" is the O2 sensor. You might need to open up the O2 sensor protective covering to reveal the colors.

How are you going to splice these wires? Using those crimps and heat shrink?

That's a good idea. I'll have to try that. I was told by a mechanic that I would be able to use posi-tite automotive wiring connectors for it. (Not specifically the ones pictured, but something similar)

 

[brent_m]

Those look reasonable way to secure a connection. It looks like a miserable location to splice wires unless you have a lift.

It seems like unless the damage is right at the female connector on the harness side, you would be able to see both sides of the wire and their corresponding color codes.

Good luck. Hope it is an easy fix.

 

[Phreaksangel]

Those look reasonable way to secure a connection. It looks like a miserable location to splice wires unless you have a lift.

It seems like unless the damage is right at the female connector on the harness side, you would be able to see both sides of the wire and their corresponding color codes.

Good luck. Hope it is an easy fix.

Yeah, unfortunately, the break of wires happened right at the base of the connector. Thanks for all your help.