Bad DEF quality and Nox sensor ? Check engine lights but they come and go
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Sekhri, Aug 18, 2017.
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Same issue here. 2014 ProStar/N13 MaxxForce. SPN-3226. No performance issues, no yellow triangle or stop engine. Sometimes the check engine light comes on, sometimes it doesn't and the fault clears. No pattern to this behavior at all. Thoughts anyone?
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There's so much that can go wrong on emissions trucks its kinda understandable that it is a pain to diagnose them sometimes.
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