2007 Hummer H3 code issue

2007 HUMMER H3
78,000 MILES • 6 CYL • 4WD • AUTOMATIC
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DAVID C CANTATORE
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2007 Hummer H-3 code issue unable to clear code po411 Reads secondary air inadequate upward flow #1.replaced valve then reset code code then read po411/po418 issue came about around December 2009 to present ran diagnostics relay,pump,pressure,sensors read okay still unable to pass N.Y. inspection. Vehicle runs fine any suggestions
May 8, 2010 at 9:59 AM
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HMAC300
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i don't know if this will help or not but it tells which codes are set and maybe you can check, but from the manual i have it says to much or a a voltage problem or a ground problem but, it could also be a bad connection as well.......


https://www.2carpros.com/forum/automotive_pictures/406719_chart_1.jpg

hoepfully you can test your system now....
Jul 11, 2010 at 2:47 PM