BoulderHummer,
I assume that your friend dissconnected the negative terminal for a couple of hours during the install? Neither my (5.3) Yukon for my H2 (6.0) had the check engine light issues with the installation of a similar product (Airaid). However, the only issue I ever had was on a F-150. I made the mistake of not dissconnecting the ground and it gave me the check engine light. I called K&N and they told me to follow the above steps and it fixed the issue.
Let us know if it resolves itself.
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2006 Fusion Orange Limited Edition H2
2008 Greystone Metallic / Sedona H2 (Sold)
2004 Sage Green H2 LUX w/ Nav (Sold)
2006 Black H3 LUX + Off Road (Sold)
2003 Yellow H2 LUX (Sold)
2003 Pewter H2 Adventure (Sold)
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