Hi,i have bought o2 sensor from mitsubishi dealer for my 91 awd.the plug on new o2 sensor is different so i could not to hook up the sensor. I cut the plug from new o2 and used my old plug from sensor,wires are connected and chek engine light was on,so swiched the wires around and it was ok,but after 3-4 days light is back again.what should i do

first of all, you should have found out which wires splice together before you actually spliced them together.

Now, you should borrow someones pocketlogger and find out what code your ecu is throwing.

If you dont have a data logger, this is how you check the codes http://www.myzero.com/electrical/code.html

why is the sensor diifferent?!


as far as I know all the 1G's use the same plug.

OK thanx for all ur help.i bought the o2 at mitsubishi just because i have a 4G63B engine i tought it might be a good one for my car.

Thats fine, but you still shouldnt have had to cut the wires. All 1G's have the same plug, turbo or n/t. I am running a 93 turbo sensor in my 90 n/t.
1G to 2G compatability is another issue, that I am not sure about.

what is the engine, what is the car?, what is the ECU?


one of us might have same thing and could look it up.

the four wires are
2Heater
sensor out
sensor ground(I THINK)

you have to match those in your car whatever it is.

1G sesnsors are ziconium based I think and they are usuakky generic.

However you can check it up on www.NTK.com\'s website to see if they have more info about your car!?


is your car a Hyundai?!?!

From what I've read (as mentioned by Amin) the 4-wire O2's have the following pinout:

- white wires x2 (heater - polarity doesn't matter)
- black wire (sensor signal)
- grey wire (sensor ground)

What is curious is that since there is a sensor ground, theoretically a missing downpipe groundstrap should have no effect. Anybody know if the early cars only had a 1-wire O2?

Its,a 91 awd turbo Talon,with JDM 93 engine.ECU is stock form talon.Iknow that the plugs should be the same but they are not.

This may help. The 91, 92 Turbo model only had a Canadian only recall on the O2 sensor. Not for the N/T and not for any other model years. Seems to me something is different.

Good luck

Cheers Tony

Yeah something might be different, but the plug I highly doubt.

hyundai, talon, laser use same engine but i think the o2 sensor they might have different connectors...for talon they have round connectors and for laser they have square like with round corners...i use to have with that same problem so what i did i connected it from wire to wire..its hard to tell which wire is for which since u've cut it already.
if engine light comes out and code 11..you prob'ly connected the wrong wires.

-Tyrone,
My 90 laser N/T has the round connector, also my 92 galant awd engine has the exact same round connector. not square