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P0400 Diagnostic Trouble Code Discussion for June 2008

Exhaust Gas Recirculation System Flow Malfunction

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Trouble Ticket Help Requests for DTC P0400
Help Request Posted
1996 Geo Tracker 1.6L MIL Lamp on VIN: 2CNBJ1861T
P0400: EGR System Performance. i have tested everything and replaced egr , transducer filter, tested the map sensor tested the solenoid, and vaccum solenoid with a filter on top. everything tested good. this is a very good customer of mine and would like to keep them happy . need help
June 05, 2008
2001 Mazda 626 ES 2.5L MIL Lamp on VIN: 1YVGF22D71
P0400: EGR System Flow Malfunction. ... 626 V6 on plugging EGR ports in intake and if so, what is the procedure for cleaning. This car passes EGR valve tests for listening for valve grunt when cycling key. Are there any other common EGR issues that will set a code P0400
June 16, 2008