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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
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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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