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Gen I O2 sensor wiring

Posted By: kamuela27

Gen I O2 sensor wiring - 05/29/07 10:08 PM

My 1989 Montero has only 2 wires on the present hookup for the o2 sensor -- a blue and a white wire. I've noticed that the wiring diagram and the Bosch replacement O2 sensor both have 4 wires.

Is there that much more of a benefit to go through the hassle of finding the origination of the two other wires? Or will the replacement of the o2 sensors with existing wires be enough?

<img src="/forums/images/graemlins/confused.gif" alt="" />
Posted By: generation_one

Re: Gen I O2 sensor wiring - 05/30/07 09:50 AM

Is there confusion about the correct sensor?
I have heard of people having this problem.

A few questions:
what diagram are you looking at?
When was your vehicle made? (stamped on the driver door post.This might not even matter, but we will see)

Do you mean to use the 4-wire as a 2-wire? Or do you want to run some new power lines to the sensor heater? Post the part number you have.



I think you should just find a universal 2-wire.
If nothing else, you can cross reference the 2 wire number to another vehicle, and tell the parts counter that's what you have. (I know of a vehicle to use but i forgot)
Posted By: Chris009

Re: Gen I O2 sensor wiring - 06/02/07 03:25 AM

Quote
My 1989 Montero has only 2 wires on the present hookup for the o2 sensor -- a blue and a white wire. I've noticed that the wiring diagram and the Bosch replacement O2 sensor both have 4 wires.



A 4 wire O2 sensor is one with a heater. The heater is energized to get the element up to temp as quickly as possible so the ECM can go into closed loop.

My guess is you bought a "universal" 4 wire oxygen sensor, which isn't completely correct for your vehicle.

I'd suggest that you buy a universal 2 wire O2 and solder it to your existing connector. The universals are a hell of a lot cheaper than the direct fit and if you know how to cut wire, solder and shrinkwrap you can save a hundred bucks pretty easily.

Chris
Posted By: hazy_daze

Re: Gen I O2 sensor wiring - 06/02/07 06:35 PM

Quote
Quote
My 1989 Montero has only 2 wires on the present hookup for the o2 sensor -- a blue and a white wire. I've noticed that the wiring diagram and the Bosch replacement O2 sensor both have 4 wires.



A 4 wire O2 sensor is one with a heater. The heater is energized to get the element up to temp as quickly as possible so the ECM can go into closed loop.

My guess is you bought a "universal" 4 wire oxygen sensor, which isn't completely correct for your vehicle.

I'd suggest that you buy a universal 2 wire O2 and solder it to your existing connector. The universals are a hell of a lot cheaper than the direct fit and if you know how to cut wire, solder and shrinkwrap you can save a hundred bucks pretty easily.

Chris


You need to be careful soldering and shrink-wrapping wires on the O2 sensor. On most O2 sensors, the refence chamber for the sensor receives it's outside air between the insulation and the wire itself. If you want to rig something, then put some electrical tape over the light if it annoys you. It'll cost about 1/2MPG in efficiency and that's it. But with gas prices, replacing the sensor will pay for itself in the long run. That and knowing it's done properly. My suggestion is to go with the exact replacement, it's WAY easier. The uni-sensors are a PITA. For 1989 the Bosch #'s: 15075 for a 3.0l street price $110 +/- and 12053 for the 2.6l $40 +/-. Verify your "born on date", because the number changes with the year. Do it right on this, if you do it at all. The electical tape works great for me <img src="/forums/images/graemlins/nana.gif" alt="" /> Hope this helps <img src="/forums/images/graemlins/cheers.gif" alt="" />
Posted By: kamuela27

Re: Gen I O2 sensor wiring - 06/13/07 02:51 AM

I've actually returned the 4-wire sensor (part# BOS15075) because I was told by the Mitsubishi dealer that the 4-wire is the incorrect part.

I am going out to reset my computer and maintenance light to see if this fixes the problem. If it doesn't, then I'll try ordering the part from the dealer. The head mechanic sold me the Montero in the first place and has been working on them for 20+ years, so I guess I'll try doing what he suggests.

Thanks for the feedback. I'll keep you posted.
Posted By: RoryTek

Re: Gen I O2 sensor wiring - 06/13/07 06:23 AM

I got mine here
http://www2.partstrain.com/products...8~MITSUBISHI~MONTERO~4~2.6~MON--001.html
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