MAF Code after cold air intake install

Zach Turner · April 7, 2021

I had a friend of mine remove the stock intake and exhaust and install an s&b cold air intake and flowmaster american thunder exhaust on my 2015 silverado with the 5.3 and I now have a MAF code being thrown and a rough idle, I found that he installed the MAF sensor backwards. I fixed it but it still has the check engine light on and rough idle. What can I do to fix this? Edit: I looked this morning and I see the exhaust tips are sooted up.

Edited April 7, 2021 by Zach Turner

Skeeter517 · April 10, 2021

I got a CEL when I did my S&B intake as well. Just need to clear it with a code reader and you should be good to go.

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steelerdude15 · April 10, 2021

Inspect the sensor and wiring harness for any damage. While you have it out, clean it with some MAF sensor cleaner to see if that will help with the rough idle.

slj2008 · April 10, 2021

when you installed the cold air unit , Did you removed the batt. cable before the installed ???

Jordon · February 5

i am having the same issue on a 2018 5.3 sierra after installing an S & B air intake system getting MAF sensor codes.... even when i clear the code the next time i shut truck off and restart i get a new code... tried leaving the ground cable off overnight and this didnt help either. Any help?