has anyone have this problem,keeps returning

 

We will need more information to help you out on this. What have you done so far to try and fix it? Tell us about your truck, mods, mileage, etc.

 

P22A7 NOx Sensor Heater Sense Circuit Range/Performance (Bank 1 Sensor 2)

 

2014 F350 stock diesel
dealer has replaced nox module and sensor-nox T
also replaced pins in connectors c110,c146 and c1581
code p22a7 has returned after 9000 miles
this is
third time in last 2 years after replacing modules and sensors

 

Chasing these can be fun, I had an issue in another breed of vehicle where we went through 5 bad oxygen sensors before we got a good one.

Has the DOC been inspected? possible cracks or damage...

If you erase the code now, how quickly does it come back? Do you notice if it only comes back under certain driving conditions?

 

thanks for your response
the last time dealer replaced module and sensor was 10000 miles ago.
truck has 40,000 miles
not sure what a doc is
taking to ford dealer am,hope its still covered under warranty
they were talking about replacing rear wiring harness
Ken

 

DOC = Diesel Oxidation Catalyst or in other words catalytic convertor.

Hopefully the dealer is able to help you out under warranty.

 

dealer delayed appt. until tues,they did state it is under warranty
I will inquire about inspecting DOC
thanks again Ken

 

@kenlh today=2/28/2022
Having same prob re: recurring P22A7 , also P0140 can any one tell me how their P22A7 problem was resolved?
My truck: 2016 F250 Superduty 4x4, diesel 6.7, with 10,000 miles
Truck sat for 2 yrs during pandemic.
Truck has cel
Truck runs absolutely fine, no black smoke, no hesitation, no misfires, nothing, seems perfectly normal
Dealer has replaced two nox sensors and one nox module
Dealer claims PCM reprogrammed, Dealer claims old codes deleted
I can't even understand whether wiring damaged, bad module, or error with re-programming
Can anyone please point me in the right direction?
I know many new o2 sensors have been delivered in non-working condition.
Does anyone know if Ford has delivered new nox sensors or nox modules in non-working condition?
Can't smog truck, can't legally register it in CA, totally effed.
Truck is complete stock. no mods.
dealer has had truck off and on for 3 months.
I presume dealer would have told me if cracked doc, but who knows?
code recurs immediately within 10 minutes of drive home fm dealer, after prob supposedly fixed

 

I've been fighting this problem since the truck was new.I'm on my 5th set of rear nox modules and sensors.Ford has no answers.
Seems light some last longer than others.
I complained to Ford they said warranty is over now costs 800 to replace
needless to say very dissappointed with there customer service

 

Today=2/28/22
Thanks to kenlh for response. Appreciate all help I can get and sympathize with your troubles.

Could we please have some suggestions from experts on this forum?

The nox modules may be being repeatedly re-designed by Ford, because Ford probably recognizes that there is a design/engineering problem
The specific part # for my nox module was DC3Z*5K202*C
So, you can see that they are already on version "C"
So there were obviously problems with versions "A" and "B" of the part.
By reviewing old TSBs and the internet, there were mentions that the nox sensor and the nox module should be replaced together as a matched set.
My parts were not replaced as a matched set. And my bad codes remain.
My Ford Service advisor told me that the idea that the two parts have to be replaced together as a matched set is "old info" and newer Ford info says only need to replace each individual part
as indicated by codes, but ...
My review of hundreds of TSBs also indicates that the PCM must be re-programmed after the new module inserted, and that the old "bad" codes must be deleted from the PCM via a specific
set of steps which Ford outlines in a TSB. My dealer swears both these steps were done, but my codes remain.
Reviewing the internet and TSBs, it is also indicated that the re-programming of the PCM is not necessarily a trivial process, and that it seems possible for a tech to inadvertently make a mistake during the re-programming. You can tell that there can be problems with re-programming PCM becaue there is in the official Ford TSBs a long section on what to do if the re-programming fails. If the reprogramming fails, there apparently is a chance that the computer/PCM becomes corrupted.
I don't know exactly what the tech would see if the re-programming fails and the PCM becomes corrupted. So how would one know if corruption of the PCM had occurred?

If one studies some of the descriptions of the Ford dtc P22A7, one gets the idea that the problem might not be fixed by replacement of the 2 nox sensors and the 2 nox modules. FWIW, My research seems to say there are 2 nox modules. My service advisor says there is only one. My truck is a 2016. There may be differences in different years.
So the exact description of P22A7 is that it includes, in addition to bad sensor, maybe some kinds of high resistance conditions.
So my reading suggests that high resistance conditions would be corrosion in connectors, loose connectors, maybe bad or loose or bent pins in connectors, yada, yada. In other words, the prob may be in one of the harnesses or connections, and not in the sensors themselves. So apparently, we have to understand diff tween high resistance conditions and low resistance conditions. High resistance lowers current flow. Low resistance raises current flow. I guess expert techs can use that info to determine what kind of wiring problem one might be dealing with.
This is about all I can drag out of my amateur study of this P22A7 issue.

We ordinary citizens are desperately trying to solve this problem.
Can we please have some help from experts?
If you are reading this post and are an expert Ford tech who thinks he can solve this mystery, I will get in my truck and drive it to you to fix.
email me.

 

wow....sorry to hear of your woes...and..this continual appearance of these types of problems on different forums is starting to bug me to the point where I just want a pre-2006 pure mechanical truck.

it is amazing how complex the ford save-a-nickel repair procedures are and how they rather replace all the wrong things once before actually applying cuase and effect knowledge to a problem...nah...lets not do a recall...lets just fix this as folks complain about it...who cares if they are stranded in the middle of no where.

 

After 3+ months of expense, hours spent in useless drive cycles, loss of use of f250, and agony, my local Ford dealer may have finally found why my
truck could not be fixed. See my prior posts. Finally, after 3+ months of dicking around, Ford engineers admitted to my dealership that the first
"new" nox sensor they replaced could have been non-functional. They replaced a second, new nox sensor and the error codes went away.
I will now do 250 miles of drive cycles to try and set the last monitor, which is the cat monitor.. The truck rode fine before and still rides fine.
But with the CEL and P22A7 and P0140, I could not smog or register the truck in California.
All this raises multiple questions. Why can't Ford test a sensor for whether it works properly before sending it off to a dealer as a new part?
What precisely are the supply chain issues which are preventing Ford owners from receiving the parts they need to properly repair Ford trucks?
Why did it take so long for Ford engineers to admit to dealership that some new nox sensors did not work?
On and on.
Bottom line: if you have P22A7 and its not getting solved, demand that the dealer replace the first supposedly new nox sensor with another nox sensor.
I am thinking that the bad sensor in question was the downstream one, but have not had paper work confirmation from dealer yet.
See my prior posts--my nox sensor has a part # version "C" designation, indicating to me at least that versions A and B weren't so good!
Will post if problem recurs or monitors don't 100% reset.
Watch for extensions of Ford warranty for emissions system. Maybe consider buying Ford extended warranty in case you have my prob after all warranties expire.
Maybe we should all try for electric trucks.

 

how many miles on engine?
how many miles between oil changes?

as engines wear, they start to burn oil, which puts metal in the exhaust...the metal contaminates the Nox sensors. once they replace it again, you could try decreasing the miles between oil changes.

 

10000 total miles,
one oil change during the 10000 miles
the truck sat for 2 yrs during pandemic
I think there is a design or engineering problem, or maybe a manufacturing defect, with the Ford nox sensors