1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

EGR codes: P0403 & P0404

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Old 07-04-2009, 02:30 PM
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Check the connection to the EGR for corrosion. Also check for leaks on the EGR system. Remove EGR and check for open pintel.
Old 07-05-2009, 07:43 AM
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The EGR valve is right behind the throttle body near the brake master cylinder.
Old 07-06-2009, 01:41 PM
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Let us know when it comes back.
Old 07-28-2009, 01:24 PM
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Sounds about right.
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