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Old 08-07-2019, 03:55 PM
chuckt63 chuckt63 is offline
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Default 98 Ranger XLT 4 cylinder 2.5L o2 Sensor

The wires of the o2 sensor in the manifold are gone. I have the new o2 sensor but cannot find where to connect it. I am assuming that the connection is missing as well but cannot find any loose wires.

I had the truck at the mechanic and he told me that my truck only has 2 sensors (pre and post cat) ad this one is just to plug the hole. I find that very hard to believe.

Any help would be appreciated.

Thanks
chuckt63
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Old 08-07-2019, 10:50 PM
Dirtman Dirtman is offline
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Default Re: 98 Ranger XLT 4 cylinder 2.5L o2 Sensor

Well... yes there are only 2 sensors. If you have 2 plugged in now then there is no 3rd connector however you don't use a o2 sensor to "plug a hole". They umm... make plugs for that
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Old 08-08-2019, 10:28 AM
dvrich dvrich is offline
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Default Re: 98 Ranger XLT 4 cylinder 2.5L o2 Sensor

This is just too funny.
Next time I go for a chest Xray, I'll tell the Doctor that 24 ribs ain't enough....please add one........better make that two, don't want to have more ribs on one side.
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Last edited by dvrich; 08-08-2019 at 05:39 PM.
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Old 08-09-2019, 10:14 AM
tomw0 tomw0 is offline
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Default Re: 98 Ranger XLT 4 cylinder 2.5L o2 Sensor

I am pretty sure the O2 sensor plugged into the exhaust manifold is the one used by the computer to adjust fuel trims. There may be a second sensor after the catalytic converter which is used to tattle on the converter being effective or not. It would report converter efficiency below standards or some such message.
The upstream(in the manifold) O2 sensor should be wired, and as I understand, all OBD-II computers would throw a code about the sensor being missing or inoperative. OTOH, if some 'technician genius' decided to jumper the O2 sensor wires and produce a fixed output to fool the computer, the wires may terminate far from where they should.
There should be a ground, heater, sense and 'base 5V reference' conductor to each O2 sensor. I think.
If you have a replacement sensor, look up higher in the engine compartment for a set of melted wires or a melted connector, or wires tied out of the way by zip ties or wire.
I suspect it could be atop the bell housing, or up on the firewall. If not, go to a dealer and find a similar model which you can inspect to see where the wires route, and what they look like.
tom
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