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I have a 2014 Mack model CXU 613 I have trouble code SPN4364…

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I have a 2014 Mack...
I have a 2014 Mack model CXU 613 I have trouble code SPN4364 & I have replaced a NOX sensor before but OS there a up stream & a down stream sensor ? Engine in truck is a MP8445E
Submitted: 9 months ago.Category: Medium and Heavy Trucks
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Answered in 38 minutes by:
3/4/2022
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 9 months ago
Mike Mcmillan
Mike Mcmillan, Shop Foreman/Triage Tech
Category: Medium and Heavy Trucks
Satisfied Customers: 6,795
Experience: Volvo/Mack Master Tech, Certified with Cummins, Eaton, GM, Hino, Detroit Diesel
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Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 9 months ago

On your issue, there is an inlet and an outlet nox sensor. The inlet is located at the bottom of the dpf housing. The outlet is located at the outlet of the scr catalyst. With this fault, I would run the nox conversion test and see if it passes or shows a defective sensor.

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Customer reply replied 9 months ago
I do not have the capability of running that test is there any other way I could what the problem would becan you assume that the temperature from the front of the cat to the rear of the cat would be at least 150 to 200 degrees difference if it was running correctly and if it is the same temperature from the inlet and the outlet then they would be a problem with the Upstream knock sensor
Technician: Mike Mcmillan, Shop Foreman/Triage Tech replied 9 months ago
No, the nox sensors will not have an effect on ex gas temp.
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