egr valves

1999 CADILLAC DEVILLE
110,000 MILES • V8 • FWD • AUTOMATIC
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CHILLYSAUCE
  • MEMBER
  • 4 POSTS
had a code of po404 which is the egr valve. so i replaced the valve .and the code poped back up can u help me
Nov 16, 2010 at 6:13 PM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
No, it is not an indication of a bad EGR valve. It indicates a problem with the EGR performance that could be due to any number of causes which the valve is only one of. It needs to be diagnosed properly using a professional scan tool and understanding of the system..
Nov 16, 2010 at 6:19 PM
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