Mechanics

CODE ISSUE

2007 Hummer H3

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
Avatar
David C Cantatore
May 8, 2010.




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....

Hmac300
Jul 11, 2010.


AD