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<blockquote data-quote="Rizzo" data-source="post: 247836" data-attributes="member: 736"><p>Thing is with nox sensors is the exhaust temp has to typically get above 300 degrees and the doser pump has to turn on before they start giving a reading. If it's really cold and the def in the tank and lines aren't thawed you will have a fault for high nox output. Extended idle in this condition doesn't help the problem either. You have an inlet nox sensor which is post turbo before the doc and outlet nox sensor which is after the scr catalyst. With the absence of def being dosed into the scr catalyst it won't see a reduction in nox and turn on the light. A poor grade of def can also cause the same issue. Nox sensors are a smart sensor and are very expensive, if the sensor module fails the engine ecm will recognize this and it is very cut and dry what the failure is at that point. If the fault has to do with a nox reading it is most likely related to the scr system not functioning correctly. As I said with the cold temps we have been having it wouldn't surprise me if you have a frozen line or tank. If you can park it inside a heated garage overnight that would eliminate that as a possible issue.</p></blockquote><p></p>

[QUOTE="Rizzo, post: 247836, member: 736"] Thing is with nox sensors is the exhaust temp has to typically get above 300 degrees and the doser pump has to turn on before they start giving a reading. If it's really cold and the def in the tank and lines aren't thawed you will have a fault for high nox output. Extended idle in this condition doesn't help the problem either. You have an inlet nox sensor which is post turbo before the doc and outlet nox sensor which is after the scr catalyst. With the absence of def being dosed into the scr catalyst it won't see a reduction in nox and turn on the light. A poor grade of def can also cause the same issue. Nox sensors are a smart sensor and are very expensive, if the sensor module fails the engine ecm will recognize this and it is very cut and dry what the failure is at that point. If the fault has to do with a nox reading it is most likely related to the scr system not functioning correctly. As I said with the cold temps we have been having it wouldn't surprise me if you have a frozen line or tank. If you can park it inside a heated garage overnight that would eliminate that as a possible issue. [/QUOTE]

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