CODE ISSUE

2007 Hummer H3

Tiny

David C Cantatore

May, 8, 2010 AT 9:59 AM

Engine Mechanical problem
2007 Hummer H3 6 cyl Four Wheel Drive Automatic 78000 miles

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

FOUND 1367 RELATED QUESTIONS

1 Answer

Tiny

hmac300

July, 11, 2010 AT 2:47 PM

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.......


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


hoepfully you can test your system now....

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