Early Duramax with DEF were known for bad NOx sensors. I don't think there was any recall, but if you had issues GM would replace them. Had both replaced on my 2011 and never had another problem. Traded in with 115K and still going strong.
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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