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I have a 2013 6.6 Duramax with 156,000 miles. I am getting the following codes; P11CB NOx Sensor 1 Performance - Signal High, P140C Exhaust Gas Recirculation (EGR) Slow Response - Decreasing Flow, and P0101 Mass or Volume Air Flow A Circuit Range/ Performance. I realize they are all emissions issues and likely caused by each other. What came first? Any suggestions as to where to start?
 

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My guess would be NOX Sensor. Just had mine replaced. Once the NOX sensor gets out of spec, I think it does affect other readings, as well. Hopefully, your mechanic can make a quick diagnosis. Even the Chev dealer had trouble figuring this one out, to be certain. We finally settled on it must be the NOX sensor; replaced it; and have not any issues since (about 4-5 months).
 
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