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Looking for an answer about o2 sensors *UPDATE* solved those issues, now have a p2195


Madman54

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So I am working on a friends truck. its a 2004 ranger 4WD 4.0l SOHC (VIN E). I am an ASE certified Master Tech, and for the life of me I cant find any info that is helpful. so i thought id come and ask the other experts.
The friend is ussually pretty competent, but not this time around. he recently swapped in an engine from a 2002 4WD auto trans and kept his manual trans. When he brought the truck to me he had cut and rewired ALL of the HO2S connections, on the plug side and the truck side. he had done the same to the wiring for the MAF and various other sensors. so the list of codes was astronomical, to say the least. so I spent a day undoing all the custom electrical work he had done using diagrams in service info from ALLDATA. Got it down to just 1 code, p0135. Im sure the remaining code is due to the sensor that he rewired being from the wrong vehicle. Im going to replace it today.
The truck is still running very poorly... So i scanned it with the enhanced ford scanner thing and it came up with 2 other codes. P2270 and P2272. I have delved into those just yet as they are o2 sensor codes and assume they will sort themselves out when i replace the oddball o2 sensors later today.

so thats the history of what i am dealing with. which is probably a bit long winded for the question i have.
the question:
How many HO2S should this truck have? it currently has 3. one in the back of each of the manifolds, and one post cat after the Y pipe.

the reason I have to ask this question is because, the wire harness has 4 connectors for HO2S (two gray, two blue) but the exhaust only has 3 holes. He drilled a hole and tried to add a sensor but it made the problem worse, and thats when all the custom electrical work started.
so whats the deal? 4 plugs, 3 holes.....
scan tool data also shows a 4th HO2S in the live data (obviously reading 0.00v
thanks in advance.
 


Rock Auto 5% Discount Code: 70D65189E6D8FF: January 5th, 2022

Madman54

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So it for sure is only supposed to have 3 HO2S. Replaced B1S1 harness side of connector damaged. truck ran great for the first drive cycle. now have p0053, p0060, p0174 (likely due to exhaust manifold leak on that side) and p2195.
 

RonD

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1986 to 2011 Rangers used the same heated O2 sensors at all locations, narrow band

O2 numbering, "Bank X, Sensor X"
S11
S21
Are upstream O2s, sensor 1's

S12
S22
Are downstream O2s, after Cats, sensor 2's
All are the same, only difference in part numbers are the length of the O2's attached wire leads

Dual exhaust systems after 1996 will always have S22, a 4th O2
Some single exhaust will have the 4th O2 if there are 2 Cats on one pipe before exhaust is combined into a single exhaust pipe

P0053 and P0060 O2 heater circuits
O2 heaters get 12volts with key on, on a shared wire, all O2s share this 12volt wire, Light Blue/Orange stripe wire
(All O2's also share a Grey/red stripe wire, for sensor part, most other sensors also use the same grey/red wire)
(So each O2 will have 2 wires that are the same and 2 wires that are different than the other O2s, and that difference is what tells computer which O2 is which)

Each O2 heater has a separate ground wire back to PCM
With key on the PCM reads the voltage passing thru the heater of each O2 to make sure it has voltage, and to see how big of a voltage drop there is
These codes mean the voltage its seeing is too high(short in heater coil) or too low, corroded or damaged wire

There are other codes like P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
Which are more common when the is no 12v at all passing thru O2 heater, so broken wire or broken heater coil

One fuse powers all the O2 heaters so there would be more codes if that fuse was blown, one from each O2

P0174 Lean on bank 2, yes, an exhaust manifold leak will suck in air giving a False Lean on that bank of the engine


But a little confused on why the friend would need to make any changes in wiring when swapping in the same model engine????
Manual or auto, 2wd or 4x4, doesn't matter for engine

Just as a heads up
You also need to install 2 new Motorcraft timing chain tensioners ASAP
The 2002 Rangers can have faulty ones from factory, and you need to change these ever 100k miles in any case
 
Last edited:

Madman54

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My credo
Stop skipping steps and get it done right the first time.
1986 to 2011 Rangers used the same heated O2 sensors at all locations, narrow band

O2 numbering, "Bank X, Sensor X"
S11
S21
Are upstream O2s, sensor 1's

S12
S22
Are downstream O2s, after Cats, sensor 2's
All are the same, only difference in part numbers are the length of the O2's attached wire leads

Dual exhaust systems after 1996 will always have S22, a 4th O2
Some single exhaust will have the 4th O2 if there are 2 Cats on one pipe before exhaust is combined into a single exhaust pipe

P0053 and P0060 O2 heater circuits
O2 heaters get 12volts with key on, on a shared wire, all O2s share this 12volt wire, Light Blue/Orange stripe wire
(All O2's also share a Grey/red stripe wire, for sensor part, most other sensors also use the same grey/red wire)
Each O2 heater has a separate ground wire back to PCM
With key on the PCM reads the voltage passing thru the heater of each O2 to make sure it has voltage, and to see how big of a voltage drop there is
These codes mean the voltage its seeing is too high(short in heater coil) or too low, corroded or damaged wire

There are other codes like P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
Which are more common when the is no 12v at all passing thru O2 heater, so broken wire or broken heater coil

One fuse powers all the O2 heaters so there would be more codes if that fuse was blown, one from each O2

P0174 Lean on bank 2, yes, an exhaust manifold leak will suck in air giving a False Lean on that bank of the engine


But a little confused on why the friend would need to make any changes in wiring when swapping in the same model engine????
Manual or auto, 2wd or 4x4, doesn't matter for engine

Just as a heads up
You also need to install 2 new Motorcraft timing chain tensioners ASAP
The 2002 Rangers can have faulty ones from factory, and you need to change these ever 100k miles in any case
thanks for the info.
the owner (my friend) is an idiot.... thats why he would make such changes. timing is taken care of, that was the reason for the swap. he had a tensioner break so he replaced them. in the process of replacing them he unknowingly dropped what looked like a screw into the intake, damaging the motor. I advised him of the tensioner problems and personally replaced them for him before he installed the motor.
I figured out which sensors were which using wiring diagrams and connector pinouts. I did it that way because he had cut and spliced into everything, litterally everything, and it was just a dangling wire mess.
so I have have determined the reason for the problems. after talking to him again, i learned some more information that i did not have before. someone had cut the cats off his truck while it was sitting with no engine. and so he pulled the exhaust from the donor truck. his originaly pipe/down pipe had the single cat on each pipe. the donor truck has the seperate style cats one of which is after the y pipe. so it only had 3 sensors, which is still a little confusiing to me, but it is what it is. anyways after looking around the internet and crossreferenciing with alldata, i got that figured out. all except for one thing.... If i was to drill a hole for bank 2 sensor 2 right next to the hole for bank 1 sensor 2, would that be acceptable? it really is the only place on the pipe thuis truck has that an add in would fit

thanks again


HO2S #11 has a very damaged connecter. so damaged that you can plug the O2 sensor in in the wrong direction. its heater circuit does have a working 12v supply and a ground. havent tested the signal side. I assume it hasnt been damaged as it reports HO2S activity on the scanner still and the sensor is brand new.
 

RonD

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Yes, you can install the 4th O2 near the 3rd O2 after the last Cat(you can get clamp on O2 Bung, if welder is not available)

But............it may set a code now and then because the PCM does test each bank by going Rich and Lean to make sure BOTH O2s on the bank are responding like they should

I am not privy to Ford's software so it may not be an issue at all, since BOTH would respond correctly, but 3rd O2 would also respond like 4th as far as voltage change
 

Madman54

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Yes, you can install the 4th O2 near the 3rd O2 after the last Cat(you can get clamp on O2 Bung, if welder is not available)

But............it may set a code now and then because the PCM does test each bank by going Rich and Lean to make sure BOTH O2s on the bank are responding like they should

I am not privy to Ford's software so it may not be an issue at all, since BOTH would respond correctly, but 3rd O2 would also respond like 4th as far as voltage change
thats a good point. im not sure if it would matter or not. but im gonna find uot in just a little while. haha
 

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Madman54

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Utah, home of the Zion Curtain :)

Restaurants that served alcohol had to have a permanent frosted glass shield around any areas where alcohol drinks were mixed or poured

i.e. https://archive.sltrib.com/images/2017/0331/dabc_ziontearouts_032917~1.jpg

Law was repealed in 2017 but restaurants still need to be inspected before they can remove these
yeah... Utah is pretty lame about everything. fortunately I live in a small town in southeastern Utah. it's not nearly as bad as the rest of the state.
Interestingly enough, Most of the restaurants in utah leave up the frosted glass. partly because they paid a lot for it considering that a lot of them redesigned their buildings to accomadate it. It never has made much difference though, because you can sit in the regular side of a place and drink beer/mixed drinks. Im guessing they want to "protect" the children from all the weird social interactions they might view in a bar setting..... like people watching football or something other than the church.
 

RonD

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In some of the smaller towns in BC the older hotels still have a signs outside at the Bar entrances
"Men's Entrance"
"Escorted Ladies Entrance"
:)
 

Madman54

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so i took a few minutes and put a B2S2 in today. truck is running much better but fuel trims still maxed out with p0171 and p0174. I guess tomorrow il start looking for vac leaks then fuel delivery issues.
thought id be done today. but one step closer is what matters
Post cat o2s ussually run about .500v, right? I never really look at the voltage number on the downstreams, just if its running steady or bouncing all over.
 

Jazzer

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Blanding? Monticello? :unsure:
 

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Post Cat O2s should be 0.7 to 0.8volt and fairly steady

The Cat(s) should burn up most of the Oxygen once they are hot enough
0.1volt high Oxygen
0.9volt low Oxygen

Any exhaust leaks will suck in more Oxygen
 

Madman54

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Post Cat O2s should be 0.7 to 0.8volt and fairly steady

The Cat(s) should burn up most of the Oxygen once they are hot enough
0.1volt high Oxygen
0.9volt low Oxygen

Any exhaust leaks will suck in more Oxygen
Blanding? Monticello? :unsure:
Not quite that far south. I live in Price. my friend (that owns the truck were talking about) has a brother that is the Post Master in Blanding.
 

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I ran Nine Mile Canyon for the rock art once, but usually go south of Moab.
 

Madman54

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My credo
Stop skipping steps and get it done right the first time.
well, I located and fixed several vac leaks on the truck and broke off on of the ports on the dpfe. oops! nothing a little jb weld didnt fix..... so I guess once i weld the bungs on and properly install the HO2S's tomorrow this thread will officially be done with.
thanks for the info guys, I tend to over think a problem sometimes, so it was nice to have some body to bounce ideas off to keep me centered.
 


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