o2 s sensor wire melted, can I just spliced it?

[Nelson_240sx]

1991 Nissan 240sx ka24de
my o2 sensor plug in (engine wire side) melted. I have a new o2 sensor for it but I need to fix the end. Can I just splice in a new end to the car side? Then put thevnew sensor in and connect it?


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[ultimateirving]

1991 Nissan 240sx ka24de
my o2 sensor plug in (engine wire side) melted. I have a new o2 sensor for it but I need to fix the end. Can I just splice in a new end to the car side? Then put thevnew sensor in and connect it?


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You should be able to repair the wire and just splice it back together, BUT why did it melt?

If there was a short in your wiring that caused the original meltdown you need to address that first.

[Nelson_240sx]

I don't have my heat shield and it was resting on the manifold.


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[silviaNC]

O2 sensors cant be spliced according to most of mechanics I've asked

[Nelson_240sx]

so I have to buy a whole new engine harness? it looks like it's just one wire. I was going to cut out the melted part and put a new end on it.


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[silviaNC]

so I have to buy a whole new engine harness? it looks like it's just one wire. I was going to cut out the melted part and put a new end on it.


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I take that back. Didnt read was engine harness side. You should be able to fix it. Do it properly tho.

[shoguner]

cut it where it burned and SOLDER a new piece of wire and a new female butt connector.

[Nelson_240sx]

thanks shotgun, will try it this weekend.


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[Allwayssideways]

Same thing happened 2 me just soder it up and u will be good

[Jtuned_andy]

do not use butt splices EVER. just solder the wires. wether its on the o2 sensor wire or the engine harness, just solder them and shrink tube it.

[R33E8]

WTF.. Where did this idea that solder is the way to go come from? Especially for this connection that will be experiencing a heat and flexing, soldering is one of the worse ways to go..

The proper way to do it is to use an un-insulated butt crimp splice and a piece of heat shrink.. If you want, send me $3 and I'll mail you splices, heat shrink, and show you how to make a crimp that Nasa would approve...

Solder splices.. You guys are funny.. :facepalm:

[Allwayssideways]

That's what I did on my car and its been fine 4 6 month's

[R33E8]

That's what I did on my car and its been fine 4 6 month's

Honestly, you could twist the wires together, cover it with bubble gum, and have it last 5 years.. That doesn't mean it the right way to do...

But honestly, a lot of methods will work including soldering.. It's just that a crimp splice is a better choice for this application..

[KevinEdgar]

I ran into the same problem and noticed it when it was time for a smog. Mine also melted from sitting against the exhaust manifold. Just peel the white casing a bit, solder the new sensor to the exposed piece then properly cover it. Then make sure to secure the wire somewhere away from the manifold.

[Kingtal0n]

Yes you can simply connect the one single signal wire to your harness and it will work. Even a 3-wire or 4-wire O2 sensor only needs that 1 single signal wire to be connected for it to work. All other other wires are for ground/power/ground

usually the signal is white. If you are not sure, just buy an $8 random O2 sensor with a single wire from pep boys and use that. I literally just start looking through their O2 sensor boxes until I find a single wire O2 sensor that price checks below $15 and buy it. They are all the same. Then wire that one single wire to the signal wire from the ECU.