CEL on Long Trip
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Mountain Pass
Joined: Nov 2022
Posts: 126
Likes: 44
OK so fairly quickly here, drove the truck today to see my Dad and got a CEL. Pulled the in-memory codes and got another code 41. Only got up to 45MPH so no long hot highway driving to make this happen. Since one of the symptoms of a bad o2 sensor is a code 41, would it be prudent to start there? I know I can test it but even if it tests good it's likely original to the truck, so I don't really feel bad about just getting a new one and see how it goes. Even if it doesn't fix it, I can rule out the o2 sensor as being the code 41 cause and would know I now have a new o2. Is there some reason to preserve the original o2 as in its better than the ones made today for example as to make testing it something I should do? I plan on keeping this truck for as long as I can drive so putting new gear in it is OK by me even if it doesn't fix it.
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
OK so fairly quickly here, drove the truck today to see my Dad and got a CEL. Pulled the in-memory codes and got another code 41. Only got up to 45MPH so no long hot highway driving to make this happen. Since one of the symptoms of a bad o2 sensor is a code 41, would it be prudent to start there? I know I can test it but even if it tests good it's likely original to the truck, so I don't really feel bad about just getting a new one and see how it goes. Even if it doesn't fix it, I can rule out the o2 sensor as being the code 41 cause and would know I now have a new o2. Is there some reason to preserve the original o2 as in its better than the ones made today for example as to make testing it something I should do? I plan on keeping this truck for as long as I can drive so putting new gear in it is OK by me even if it doesn't fix it.
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
Thread Starter
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Mountain Pass
Joined: Nov 2022
Posts: 126
Likes: 44
Thread Starter
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Mountain Pass
Joined: Nov 2022
Posts: 126
Likes: 44
Not sure it matters here, but the truck is a Canadian truck. Built at the Canadian Ford Factory.
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Fleet Owner
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From: Kentucky
All of my OBS Ford trucks were built in Canada. Those code Innova 3145 code readers are pretty good. It appears to be displaying the correct codes the computer is sending out. No worries something amiss with the reader.
As far as replacing the O2 sensor, I am all for replacing one that old. The caveat is busting it loose from the y/h-pipe. You may be in for a huge challenge. At least that was the case on my old 1992 F350 w/5.8L engine a few years ago. Never get the original O2 sensor out. I ended up replacing the entire h-pipe with a Bassani y-pipe. And a new O2 sensor...
As far as replacing the O2 sensor, I am all for replacing one that old. The caveat is busting it loose from the y/h-pipe. You may be in for a huge challenge. At least that was the case on my old 1992 F350 w/5.8L engine a few years ago. Never get the original O2 sensor out. I ended up replacing the entire h-pipe with a Bassani y-pipe. And a new O2 sensor...
Thread Starter
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Mountain Pass
Joined: Nov 2022
Posts: 126
Likes: 44
Certainly won't hurt anything to swap it out. Maybe save the original until you are sure it is the problem. As we discussed, there are other components that can cause the code. So it is up to you to decide if you want to test the other components or replace the O2. Strictly up to you. Since your code was in memory and not active did you have the truck at operating temperature when you tested?
Thread Starter
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Mountain Pass
Joined: Nov 2022
Posts: 126
Likes: 44
All of my OBS Ford trucks were built in Canada. Those code Innova 3145 code readers are pretty good. It appears to be displaying the correct codes the computer is sending out. No worries something amiss with the reader.
As far as replacing the O2 sensor, I am all for replacing one that old. The caveat is busting it loose from the y/h-pipe. You may be in for a huge challenge. At least that was the case on my old 1992 F350 w/5.8L engine a few years ago. Never get the original O2 sensor out. I ended up replacing the entire h-pipe with a Bassani y-pipe. And a new O2 sensor...
As far as replacing the O2 sensor, I am all for replacing one that old. The caveat is busting it loose from the y/h-pipe. You may be in for a huge challenge. At least that was the case on my old 1992 F350 w/5.8L engine a few years ago. Never get the original O2 sensor out. I ended up replacing the entire h-pipe with a Bassani y-pipe. And a new O2 sensor...
Edit: Do you recall where you got the o2 sensor from?
Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
Here are some useful tips in case you run into some stuck O2 problems. Click below and it should open,
https://www.google.com/search?q=o2+sensor+removal+tricks&sxsrf=APwXEdcz_6 AOzV8VCDdhAltg2xMxN1uKUw%3A1684955890672&source=hp &ei=8mJuZIvZJtLg9APN4bD4Dg&iflsig=AOEireoAAAAAZG5x Ahrshc6S-s9PK7MV5kzVWnB17fMl&oq=o2+sensor+removi&gs_lcp=Cgd nd3Mtd2l6EAEYATIFCAAQgAQyBggAEBYQHjIGCAAQFhAeMgYIA BAWEB4yBggAEBYQHjIGCAAQFhAeMgYIABAWEB4yBggAEBYQHjI GCAAQFhAeMgYIABAWEB46BwgjEOoCECc6BAgjECc6BwgjEIoFE Cc6CAgAEIoFEJECOgsIABCABBCxAxCDAToRCC4QgAQQsQMQgwE QxwEQ0QM6DgguEIAEELEDEMcBENEDOg4ILhCvARDHARCxAxCAB DoICAAQgAQQsQM6CwgAEIoFELEDEIMBOg4ILhCABBCxAxDHARC vAToLCAAQigUQsQMQkQI6CggAEIAEEBQQhwJQ5B5Y0ERgxGFoA XAAeACAAYsBiAG0DZIBBDYuMTCYAQCgAQGwAQo&sclient=gws-wiz#kpvalbx=_AGNuZKmqJsTD9AOiyoaICw_31
https://www.google.com/search?q=o2+sensor+removal+tricks&sxsrf=APwXEdcz_6 AOzV8VCDdhAltg2xMxN1uKUw%3A1684955890672&source=hp &ei=8mJuZIvZJtLg9APN4bD4Dg&iflsig=AOEireoAAAAAZG5x Ahrshc6S-s9PK7MV5kzVWnB17fMl&oq=o2+sensor+removi&gs_lcp=Cgd nd3Mtd2l6EAEYATIFCAAQgAQyBggAEBYQHjIGCAAQFhAeMgYIA BAWEB4yBggAEBYQHjIGCAAQFhAeMgYIABAWEB4yBggAEBYQHjI GCAAQFhAeMgYIABAWEB46BwgjEOoCECc6BAgjECc6BwgjEIoFE Cc6CAgAEIoFEJECOgsIABCABBCxAxCDAToRCC4QgAQQsQMQgwE QxwEQ0QM6DgguEIAEELEDEMcBENEDOg4ILhCvARDHARCxAxCAB DoICAAQgAQQsQM6CwgAEIoFELEDEIMBOg4ILhCABBCxAxDHARC vAToLCAAQigUQsQMQkQI6CggAEIAEEBQQhwJQ5B5Y0ERgxGFoA XAAeACAAYsBiAG0DZIBBDYuMTCYAQCgAQGwAQo&sclient=gws-wiz#kpvalbx=_AGNuZKmqJsTD9AOiyoaICw_31
Thread Starter
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Mountain Pass
Joined: Nov 2022
Posts: 126
Likes: 44
So spent a little time on this. Code 41 seems to indicate possibly two different problems:
HO2S circuit indicates system lean (right HO2S)
No HO2S switch detected (right HO2S)
I am not sure which I am getting on my truck. Maybe a quirk with how OBDI works in that a code can have multiple meanings and you cannot be sure sometimes what code means what. I think @sandymane alluded to this referring to code 41 as being tricky to figure out.
Based on the above options I read this to mean either the o2 is not connected or malfunctioning, or option two, the o2 sensor is picking up a lean condition. Assuming I have that correct, how would one know which issue the computer is seeing? And with the lean option being true, would that point to perhaps the low fuel pressure @Prototypemech mentions earlier in this thread?
I ordered this O2 sensor:
Hopefully will get time to install soon and see where things go.
HO2S circuit indicates system lean (right HO2S)
No HO2S switch detected (right HO2S)
I am not sure which I am getting on my truck. Maybe a quirk with how OBDI works in that a code can have multiple meanings and you cannot be sure sometimes what code means what. I think @sandymane alluded to this referring to code 41 as being tricky to figure out.
Based on the above options I read this to mean either the o2 is not connected or malfunctioning, or option two, the o2 sensor is picking up a lean condition. Assuming I have that correct, how would one know which issue the computer is seeing? And with the lean option being true, would that point to perhaps the low fuel pressure @Prototypemech mentions earlier in this thread?
I ordered this O2 sensor:
Hopefully will get time to install soon and see where things go.