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Old 10-23-2019, 05:04 AM   #1
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Join Date: Jun 2015
Posts: 318
Another trip, another check engine light.....

Last time out I had a check engine light turn on, but it cleared itself. This time out, after 400 miles of a 700 mile trip, it turns on again. I checked the codes using the dash, and it is SNP 3216 FMI 2.
Can anybody confirm that this is the Outlet side NOX sensor gone bad ?
It looks pretty easy to change, if it is, but what is the best place to buy one. I am not used to buying large truck parts............... Oh, the coach has 5200 miles........
Thanks in advance for any help with this issue

2015 Dutch Star 4381
Workin on the road
Currently Houston Tx
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Old 10-23-2019, 06:12 AM   #2
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Location: Mims, Fla
Posts: 128
When I have had an issue like this, I have called Freightliner (if its a FL) discuss the issue with them (is it OK to drive) and they can source the part and nearest location of get it repaired. Good luck

2019 Newmar DSDP 4369
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Old 10-23-2019, 06:38 AM   #3
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I had the CE light for a nox sensor and it was cured with a software update at a FL dealer.

Agree with the suggestion to call the FL help line especially if you are under warranty.
2016 Newmar Ventana 4369 with 2014 CRV toad
Full timing since 2016
My life goal is to be as smart as the others on this forum.
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Old 10-23-2019, 07:02 AM   #4
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Thanks for the help gents, I'll call them, but as I live in the coach, I'd rather fix it in situ, than have it sit at a dealer for days.
I don't think my coach has ever had a software update, so maybe it was a common issue, and that's all it needs.
Thanks again !
2015 Dutch Star 4381
Workin on the road
Currently Houston Tx
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Old 10-23-2019, 10:51 AM   #5
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Spartan Chassis
Join Date: Aug 2015
Location: Northwest Washington State or Western Montana, depending on the season.
Posts: 3,282
We had a similar issue with our 2014 Ventana LE and took it to a Cummins service center. They updated the software (28 updates!) and the issue was resolved.

This is not something that can be done "in situ," unless you can convince a Cummins or Freightliner service center to send out a mobile tech. And, I can assure you that it will not be inexpensive.

Jim (W7DHC), Diane & Mini Schnauzers, Lizzy & Ellie
2018 Mountain Aire 4047 + 2014 Honda CR-V "toad" w/AF1
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Old 10-23-2019, 11:45 AM   #6
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Get it to Cummins, I had similar symptoms. Cummins fixed everything under their five year warranty.

Terry & Kathy
2012 Dutch Star DP 4346
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