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
have the same problem?
Saturday, May 8th, 2010 AT 9:59 AM