EGR valves

Tiny
CHILLYSAUCE
  • MEMBER
  • 1999 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 110,000 MILES
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
Tuesday, November 16th, 2010 AT 6:13 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
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.
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Tuesday, November 16th, 2010 AT 6:19 PM

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