O2 Sensor Location
Thread Starter
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Cross-Country
Joined: Feb 2004
Posts: 94
Likes: 8
From: Lincoln, NE
O2 Sensor Location
Greetings to all. New guy here...I just discovered this forum, and really like it so far.
I apologize if this thread has been posted before, but since the search feature is currently disabled, I'm posting my question.
Where are the O2 sensors located on a 1994 B4000? There's two of them, correct? I see lots of wires, but am not sure which are what.
A year ago, it was knocking at higher speeds (60mph+), and the rpm would suddenly increase as if I had downshifted out of OD, even though I was cruising with CruiseControl engaged. The CEL came on, and I took it to a reputable mechanic, he noticed the O2 sensor was just "caked with dirt". He cleaned it off (did not replace because it wasn't necessary) and only charged me $30 for his time.
I'd like to just be able to inspect them myself the next time this happens.
I apologize if this thread has been posted before, but since the search feature is currently disabled, I'm posting my question.
Where are the O2 sensors located on a 1994 B4000? There's two of them, correct? I see lots of wires, but am not sure which are what.
A year ago, it was knocking at higher speeds (60mph+), and the rpm would suddenly increase as if I had downshifted out of OD, even though I was cruising with CruiseControl engaged. The CEL came on, and I took it to a reputable mechanic, he noticed the O2 sensor was just "caked with dirt". He cleaned it off (did not replace because it wasn't necessary) and only charged me $30 for his time.
I'd like to just be able to inspect them myself the next time this happens.
Thread Starter
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Cross-Country
Joined: Feb 2004
Posts: 94
Likes: 8
From: Lincoln, NE
No I don't. If I did at that time, I've forgotten by now.
I forgot to add, that the engine has been running great ever since. I hadn't realized just how much power I had been slowly losing.
This is a low milage truck, only 60,000 on it. I don't mind paying someone else to do something that I can't, but this seems like it should be easier than replacing the serpentine belt, or the fuel filter, which I have done. I'm not a stranger to the wrench, just have difficulty discerning all the electrical "stuff".
I forgot to add, that the engine has been running great ever since. I hadn't realized just how much power I had been slowly losing.
This is a low milage truck, only 60,000 on it. I don't mind paying someone else to do something that I can't, but this seems like it should be easier than replacing the serpentine belt, or the fuel filter, which I have done. I'm not a stranger to the wrench, just have difficulty discerning all the electrical "stuff".
Posting Guru
Joined: Nov 2003
Posts: 1,221
Likes: 0
From: Homer, Alaska
On the 94, I think there are two but please don't hold me to that! There are some threads on this forum and on the 4.o forum about the 02 sensors. Look at the technical notes on both forums for the answers. Hope that helps.
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
Welcome aboard!
Maybe one of the guys with a '94 4.0L can chime in, but I think you only have 1 oxygen sensor for that year, and its threaded into the exhaust where the Y-Pipe joins with the catylitic converter. Here's a nice clean picture to give you an idea of what you are looking for:
Notice the shorter end is the part that gets threaded into the pipe, so you will only see the other side of that sticking out of the pipe, with the wires attached.
But I agree, if your CEL came on, then you should pull the codes from the computer first, since your problem may have nothing to so with the O2 sensor(s). You don't need a mechanic to obtain the codes, here is one of the many fine "how to" webpages on the subject:
Pulling Ford EEC-IV Trouble Codes
Pull the codes and post them here, and then we will be able to better help you diagnose and repair your problem.
Good luck!
Maybe one of the guys with a '94 4.0L can chime in, but I think you only have 1 oxygen sensor for that year, and its threaded into the exhaust where the Y-Pipe joins with the catylitic converter. Here's a nice clean picture to give you an idea of what you are looking for:
Notice the shorter end is the part that gets threaded into the pipe, so you will only see the other side of that sticking out of the pipe, with the wires attached.
But I agree, if your CEL came on, then you should pull the codes from the computer first, since your problem may have nothing to so with the O2 sensor(s). You don't need a mechanic to obtain the codes, here is one of the many fine "how to" webpages on the subject:
Pulling Ford EEC-IV Trouble Codes
Pull the codes and post them here, and then we will be able to better help you diagnose and repair your problem.
Good luck!
