2007 Hummer H3 code issue

Tiny
DAVID C CANTATORE
  • MEMBER
  • 2007 HUMMER H3
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 78,000 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
Saturday, May 8th, 2010 AT 9:59 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
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....
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Sunday, July 11th, 2010 AT 2:47 PM

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