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· Supr Mod, AutoTech 🥇Mbr Extraord, 🏅TOTM SS-Guru
2015 High Country Duramax
19,588 Posts
I would pitch a fit at the "mechanic". Taking hours to only tell you that is pathetic.

Get the code read and see what it actually says. A CEL means nothing unless you get the code. That can help narrow it down as to what to start looking for.

My guess is that if it's a MAF code then you either have a wiring issue (not likely if it was working before the cai), a bad sensor (again not likely if it was working beforehand), or a leak after the MAF, which is highly likely.

If it's not MAF related, then you need to look elsewhere depend on what the code is.
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