O2 sensor wiring
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Junior Member
Joined: Feb 2018
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O2 sensor wiring
Hello folks, I am new to the forum. I have been hanging around for a while reading up trying to learn as much as I can. Thanks for letting me join up!
I have a problem I can't find any info on. Maybe I haven't masted the search tab yet.
Anyway. I have a 95 F150 XL 5.0 auto. It has throwing a 172 code as well as a 332 code (KOEO on both). Since the truck has 140k miles I decided to go ahead and change the O2 sensor since it probably was the original. After crawling under the vehicle I found that the mating connector on the chassis side of the sensor is broken and the keying part is gone. The pins are still there and can be plugged in but I have no way of knowing if it's plugged correctly. I am going to change the connector but I will have to probe out the wires to get it wired correctly. What do I need to be looking for when I probe it out? I believe the sensor has 2 white wires for the heater. A gray sensor ground and a black signal wire. Does the + heater wire have battery voltage with the ignition on? How do I tell the difference between the sensor ground and the heater ground?
I can address the 332 code later but I would like to get the O2 problem fixed first.
Thanks in advance. I look forward to learning more about my truck and leaning on the wealth of knowledge on the forum.
I have a problem I can't find any info on. Maybe I haven't masted the search tab yet.
Anyway. I have a 95 F150 XL 5.0 auto. It has throwing a 172 code as well as a 332 code (KOEO on both). Since the truck has 140k miles I decided to go ahead and change the O2 sensor since it probably was the original. After crawling under the vehicle I found that the mating connector on the chassis side of the sensor is broken and the keying part is gone. The pins are still there and can be plugged in but I have no way of knowing if it's plugged correctly. I am going to change the connector but I will have to probe out the wires to get it wired correctly. What do I need to be looking for when I probe it out? I believe the sensor has 2 white wires for the heater. A gray sensor ground and a black signal wire. Does the + heater wire have battery voltage with the ignition on? How do I tell the difference between the sensor ground and the heater ground?
I can address the 332 code later but I would like to get the O2 problem fixed first.
Thanks in advance. I look forward to learning more about my truck and leaning on the wealth of knowledge on the forum.
Member
Joined: Jan 2018
Posts: 11,256
Likes: 1,770
From: Memphis, TN, Earth, Milky Way
When you post fault codes, include the COMPLETE definition for each one. Click this & read the caption:
(phone app link)
And we need to know EVERYTHING about the truck - particularly '94-95s, when there were so many variations. Follow the instructions in this caption to fill out your signature:
(phone app link)
Post several pics of the damaged connector & HEGO wiring. There's a link in that caption that explains how. Don't replace the HEGO unless it's damaged, or it fails a published test. It's not on the maintenance schedule, so it doesn't need to be changed just because of time or miles. You can look up most of the truck's wiring at this link (you don't have to use a real e-mail to get access):
http://www.bbbind.com/free_tsb.html
I highly recommend you buy a Haynes manual (late red cover or early blue edition) and read it cover-to-cover at least once. Keep some highlighters handy so you can mark important things that apply to your truck, and mark out (without obscuring) things that don't.
(phone app link)
(phone app link)
And we need to know EVERYTHING about the truck - particularly '94-95s, when there were so many variations. Follow the instructions in this caption to fill out your signature:
(phone app link)
Post several pics of the damaged connector & HEGO wiring. There's a link in that caption that explains how. Don't replace the HEGO unless it's damaged, or it fails a published test. It's not on the maintenance schedule, so it doesn't need to be changed just because of time or miles. You can look up most of the truck's wiring at this link (you don't have to use a real e-mail to get access):
http://www.bbbind.com/free_tsb.html
I highly recommend you buy a Haynes manual (late red cover or early blue edition) and read it cover-to-cover at least once. Keep some highlighters handy so you can mark important things that apply to your truck, and mark out (without obscuring) things that don't.
(phone app link)