Lots of DEF

[Too Tall]

Wondering if a NOX sensor is faulty telling the PCM need more DEF due to high NOX?. There's 2 of them.

 

[Cummins12V98]

Is this the same guy you mentioned several months ago when I mentioned his SCR / exhaust might be restricted with caked up DEF?

YES, this has been going on for quite a while but not one Dealer has addressed his issues. He is at my local Dealer this am. Hope they take care of him!!!

 

[Newsa]

If the DPF is good, you should have zero black soot in the tailpipe, even with several hundred thousand miles.

My DPF may not be working well. Here is a picture of my slightly sooty tail pipe and a picture of a 2017-2019 powerstroke that appears to have many fewer miles than mine. I'm approaching 78k miles.

 

[Cummins12V98]

Newsa that is what my friends 13 looks like. The Service guy was not in on his appointment day and they had no clue what to do but scan the truck and charge him $200. He said NO WAY and has yet to get a new appointment. The rookie service guy wouldn't let him talk to the Tech.

 

[Newsa]

Newsa that is what my friends 13 looks like. The Service guy was not in on his appointment day and they had no clue what to do but scan the truck and charge him $200. He said NO WAY and has yet to get a new appointment. The rookie service guy wouldn't let him talk to the Tech.

I have a persistent High NOx code that has been there for 20,000 miles. Truck runs great and it still does active regens.

I will run it as us until it has problems. No other codes ever show up just the High NOx. I have a check engine light on my dash that doesn't bother me, anymore.

I imagine that probably soot has coated the catalyst in the SCR so it's not doing its job?

But as long as it pulls fine, I will just drive it. If I have to replace the entire exhaust system, I will. (But only if it no longer runs or gives me some sort of countdown.)

My Maxcare has expired and I imagine so has my federal emissions warranty.

I'm not using a lot of DEF tho.

 

[AH64ID]

I have a persistent High NOx code that has been there for 20,000 miles. Truck runs great and it still does active regens.

I will run it as us until it has problems. No other codes ever show up just the High NOx. I have a check engine light on my dash that doesn't bother me, anymore.

I imagine that probably soot has coated the catalyst in the SCR so it's not doing its job?

But as long as it pulls fine, I will just drive it. If I have to replace the entire exhaust system, I will. (But only if it no longer runs or gives me some sort of countdown.)

My Maxcare has expired and I imagine so has my federal emissions warranty.

I'm not using a lot of DEF tho.

Regen and soot have exactly ZERO to do with SCR.

 

[Newsa]

Regen and soot have exactly ZERO to do with SCR.

I realize they are separate, however I thought that the DPF was upstream of the SCR. Thus, if soot is coming out the back side of the DPF, it might coat parts of the SCR with residue.

 

[AH64ID]

I realize they are separate, however I thought that the DPF was upstream of the SCR. Thus, if soot is coming out the back side of the DPF, it might coat parts of the SCR with residue.

Possible, but your tailpipe would also be black.

You linked the two systems by making comments about a high nox code and active regens, no link exists.

 

[Newsa]

Possible, but your tailpipe would also be black.

You linked the two systems by making comments about a high nox code and active regens, no link exists.

If soot covers the catalyst in the SCR because the SCR is downstream, wouldn't that make the catalyst in the SCR not work correctly? I believe there is a catalyst in the SCR that works with the DEF and if one of those is not working optimally (in my case, possibly soot inside the SCR), wouldn't that cause the SCR not to work optimally and allow NOx to be detected?

 

[AH64ID]

Do you have a sooted up tailpipe?

The SCR is not a particulate filter, so soot in would be soot out.

 

[Newsa]

Do you have a sooted up tailpipe?

The SCR is not a particulate filter, so soot in would be soot out.

There is soot residue on the inside of my tailpipe. So even though the SCR is not a particulate filter, I assume there is likewise some soot in the SCR. The tailpipe is also not a particulate filter, but that doesn't stop soot from depositing there.

Didn't used to be that way. I had a clean tailpipe for at least 40k.

 

[Cummins12V98]

Mine has been clean for 85k.

Hey could someone post a pic for me of a FleetGuard StrataPore oil filter that shows "Made in Mexico" on it please.

Having a debate about this on another forum

 

[brucejohnson]

I have a persistent High NOx code that has been there for 20,000 miles. Truck runs great and it still does active regens.

I will run it as us until it has problems. No other codes ever show up just the High NOx. I have a check engine light on my dash that doesn't bother me, anymore.

I imagine that probably soot has coated the catalyst in the SCR so it's not doing its job?

But as long as it pulls fine, I will just drive it. If I have to replace the entire exhaust system, I will. (But only if it no longer runs or gives me some sort of countdown.)

My Maxcare has expired and I imagine so has my federal emissions warranty.

I'm not using a lot of DEF tho.

Possibility: You might try looking at the DEF injector. A clog may lower DEF usage resulting in higher NOx under load. Also, an EGR cleansing?

 

[C M McCormick]

@Cummins12V98 here you go. I've been using them since 2002 and never noticed that. And my first 01 was made in St Louis.

 

[Cummins2014]

@Cummins12V98 here you go. I've been using them since 2002 and never noticed that. And my first 01 was made in St Louis.
View attachment 129826

Truck is made in Mexico, we might as well use Mexican filters

 

[Cummins12V98]

Truck is made in Mexico, we might as well use Mexican filters

Might as well give up and buy everything from other Countries!!!

 

[Cummins12V98]

@Cummins12V98 here you go. I've been using them since 2002 and never noticed that. And my first 01 was made in St Louis.
View attachment 129826

My 98 12V was Made in St Louis and my other 12V.

Really appreciate the pic as it saved me from stopping at MotorTruck to take a pic of a filter to prove to this guy on another forum that insists the filters are US made as he knows the rep. Like a friend always says "prove it".

Thanks!!!

 

[Cummins2014]

Truck is made in Mexico, we might as well use Mexican filters [/QUOTE

 

[Cummins2014]

Might as well give up and buy everything from other Countries!!!

Hey, I use the Donaldson now

 

[Cummins2014]

My 98 12V was Made in St Louis and my other 12V.

Really appreciate the pic as it saved me from stopping at MotorTruck to take a pic of a filter to prove to this guy on another forum that insists the filters are US made as he knows the rep. Like a friend always says "prove it".

Thanks!!!

You are going to have to wait , you guys bickering got that thread shut down. You will have to prove him wrong another way .