NOx efficiency low, SPN 4364 FMI 1 and 18. SPN 3364 FMI 2 and 17. Try this work first.

[@Armannortheast]

Be honest with you. You are from best of best number one mechanic. No one s professional like you in USA. 🇺🇸

[@CarlosDieselElectric]

Thank you

[@chrisfrancis6881]

So bottom line what was the problem? Bad sensor?

[@hartfordautocenter]

I did this for 2019 and it’s works perfectly,

[@Louis19699]

Only one thing makes me suspicious. Nox sensor measure nox concentration . Correct? Now how outlet sensor readings higher then inlet sensor. If sensors reading correct numbers outlet sensor can't read higher then front What producing the extra nox amount?😎 I think the problem in that case is the outlet nox sensor. I was checking my theory on two different truck with bad scr filter. Im not saying that scr box is functional and Im not saying outlet nox sensor replacement going to bring up efficiency. Only saying according the numbers in my experience if both sensor is good outlet sensor never higher than the inlet . But im not in the commercial truck repair business just a diagnostic and troubleshooting fanatics having fun help for my trucker friends. Watching every episodes and thank you for your hard work creating the videos. 🍻🍻

[@CarlosDieselElectric]

In my instance, the tail pipe had heavy soot. Usually means the DPF may have issues even though you can complete a successful regen or the One Box may have an internal issue or failure.

[@Louis19699]

I think you misunderstood me and we r not the same page. Not trying to judge or question your decision . Also I not saying that 1box is functional. Only saying is outlet nox sensor IF working properly can not be higher then inlet sensor. Unless some small engine hiding inside the scr and puffing out nox.😃. Just think of the dddl low temperature regen for nox sensor drifting test . I hope no hard feelings because I have a loudmouth.✌️

[@CarlosDieselElectric]

@@Louis19699 Roger that. No feelings hurt at all I understand 👍🏼

[@Louis19699]

🍻

[@govinlama2731]

I Love your videos ❤❤❤❤❤❤❤ appreciating

[@joekeefe3229]

good tip, ive used it before works perfect. My ? is on a ghg 17 parked scr performance test. the truck puts out pretty much 0 outlet nox but fails the test, dddl say it failed MU3 test. What is MU3 test?

[@omeezey11]

Can you drive the truck like this? Not ideal or maybe legal, but in an emergency situation?

[@CarlosDieselElectric]

Great question, yes you can drive like this to get you where you have to go. If the efficiency is low or below passing, it could be a bad One Box, bad DPF or sensors. It isn’t illegal, again just helps you get from point A to point B.

[@J_R15]

How can I make an appointment with you? I’ve tried 3 different shops and none have fixed my issue with these codes

[@CarlosDieselElectric]

Call my shop 323-728-4721 so we can talk more about what is going on with your truck and what you have done so far.

[@J_R15]

SPN 5246 FMI 0 SPN 3364 FMI 2 SPN 4364 FMI 1 SPN 4364 FMI 18 SPN 5246 FMI 15 SPN 5246 FMI 16

[@doruk2a]

For how long will work this method? And how many time can do it before changing dpf filters ? Thanks

[@CarlosDieselElectric]

The sensor on the outside is so the inlet reads one thing but the outlet sensor will rear clean air and the efficiency should almost be 100%. The DPF filters themselves don’t have to be serviced until the MCM or ACM says so.

[@walln9908]

In this case have to replace the DPF or SCR filter which one is bad ?( can you replace just one filter?) Or at one box sistem is just to replace all box?

[@CarlosDieselElectric]

In a One Box. Only the DPF can be replaced. The DOC and the SCR are built into the unit and cannot be purchased separately

[@KaspaMaxi-mp6ym]

Works on 2016 dd15. Throws a code so dealer knows its been jacked with but truck runs fine. I forked the nox outlet harness loom and all. Have 2nd sensor in enclosure under my fridge in bunk. Almost Impossible to tell its bypasses by looking at things. It gets hot on its own thsts why its in a metal enclosure

[@mehdiraza85]

Hello. SPN 4364 FMI 18 amd SPN 3364 fmi 2 comes up. Then i have to do a parked regen and then the code goes away. What could be the reason

[@derpasaurusrex8335]

This is called a bypass. California does not like this. And ghg17 models have a setting that detects this and will derate immediately. Only works on epa10 and ghg14 models. 2010-2016. Best thing to do is disconect the metering valve on these the botom two pin injector on the Metering valve and run a regen to burn off def deposits. After a regen reconnect and perform the efficiency test. If the effeciency rises the one box has been cleaned. If not the one box/scr module has failed.

[@CarlosDieselElectric]

The by pass is definitely a temporary thing especially if just need to get from point A to point B. New trucks are definitely getting smarter.

[@derpasaurusrex8335]

@@CarlosDieselElectric agreed.

[@javimontalvan8175]

So was the Nox sensor bad? I’m having this issue right now with the same codes

[@CarlosDieselElectric]

Could be a bad sensor. Depending on the reading. What is your outlet ppm reading?

[@dell7054]

YES THIS HAS WORKED FOR ME 2018 CASCADIA DD15.. DO THIS AND FUC THE DEF.. UNLESS u do a delete

[@MejoM-p5z]

I have 2014 Cascadia DD15 , I by pass today but amber lights on after 4 hours of drive climbing on hill also code thrown SPN 3057 fmi2 , my truck will derate ? I can continue drive like this forever? please advise

[@CarlosDieselElectric]

@@MejoM-p5z which sensor did you try this with? What codes did you have prior?

[@ericsaldana7042]

So the 1 box is done & the sensor is still good. Am I understanding that correctly?

[@CarlosDieselElectric]

NOx efficiency needs to be 70% or higher. The outlet sensor should read around 50-60 PPM. If you have different readings you may have an issue with internal failure or soot may be pushing through. Look for any signs of soot at the outlet pipe

[@dell7054]

​@CarlosDieselElectric mostly external these boxes don't last more than 500k. I did the same and so far so good

[@noesnaula8863]

Very good videos❤

[@jamesx3030]

I got a fault code 5018/18 , the dealership is going to clean the doser valve, they also blew my coolant line😢

[@Steve.191]

Thank you 👍

[@Dmtr909]

Thank you bro 😎

[@jorgefacio690]

so at 650k or 750k one will have to replace the one box???

[@CarlosDieselElectric]

According to Detroit they said the life of the One Box is around 650-700K miles. I have seen them last longer but I think it depends on maintenance history, idle time, City driving versus over the road.

[@jorgefacio690]

@@CarlosDieselElectric ah ok I just got a new code on my 2012 freightliner that I have never seen before. would you have any idea what it means? BRAKE SPN000639 J1939 NETWORK 9.

[@dieselmobiletruck1631]

Good morning Mrs pedro I have the same problem with a 2014 freightliner 114sd Detroit dd13 and in my case the DEF light is flashing when I do the regeneración start whit 2% and goes up to 98% and drops out to 40% after 20 minutes the SCR test fails any ideas. So far I replace the DPF filters because they're were cracked put a new I that the it was all but I have the DEF light flashing like I mentioned before

[@CarlosDieselElectric]

What is the DOC inlet pressure? Also, on the tail pipe, do you have any signs of soot ?

[@norcalgorilla]

​@@CarlosDieselElectric doc inlet is reading at around 0.63 psi at its hottest

[@norcalgorilla]

There's soot but not much built up

[@CarlosDieselElectric]

@@norcalgorilla how long does the regen run before it aborts or it is stopped?

[@norcalgorilla]

@@CarlosDieselElectric it runs the regen for about 40 minutes. It reaches the target temperatures, 600 and 1200 degrees. Once it reaches target temp, the scr efficiency just drops.

[@muktisah4271]

Send me detail 1844 fault code

[@kamleshsahstpl9231]

Send me detail of 1844 fault code

[@CarlosDieselElectric]

What kind of truck and what kind of engine?

[@dieselmobiletruck1631]

4364 fmi 1 fmi 18

[@CarlosDieselElectric]

Check for any signs of soot in the exhaust pipe. You may have a compromised One Box that is allowing soot to pass through to the SCR and that will definitely give you a NOx efficiency low. Check you DEF quality.

[@dieselmobiletruck1631]

I did check with the refractometer

[@dieselmobiletruck1631]

Hey Mrs pedro you were right about the SCR passing soot to DPF yes that's were the problem was thanks for your help

[@CarlosDieselElectric]

@@dieselmobiletruck1631 glad you found the problem. Hopefully the truck can be fixed. I wish Detroit would have designed the One Box differently. I do like how Cummins does it. Keep everything separate and serviceable.

[@dieselmobiletruck1631]

Yes sr you are right in this case isn't. The SCR DPF is all in one that way they called one box. But once again whit all may respect thanks again Mrs pedro