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P0400 Diagnostic Trouble Code Discussion for May 2009

Exhaust Gas Recirculation System Flow Malfunction

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Trouble Ticket Help Requests for DTC P0400
Help Request Posted
1996 Mercedes-Benz E320 3.2L MIL Lamp on VIN: WDBJF55F1T
P0400: EGR Flow Malfunction. Vehicle keeps setting code P0400 (EGR flow malfunction)after 25 to 35 miles of driving after code is cleared. EGR valve is new and tubes to and from it are clear. Exhaust flows freely from exhaust manifold when tube to EGR valve is removed and engine is starte...
May 06, 2009