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P0400 Diagnostic Trouble Code Discussion for February 2014

Exhaust Gas Recirculation System Flow Malfunction

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Trouble Ticket Help Requests for DTC P0400
Help Request Posted
1999 Mercedes-Benz E320 3.2L MIL Lamp on VIN: WDBJF65H2X
P0400: egr flow. I don't have enough information to fix this po400. Alldata and Mitchell both come short. To my understanding, monitor runs intrusive test on long decel when PCM opens egr valve and looks for map change. Map sensor vacuum supply line seems to have a check valve...
February 18, 2014