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P0400 Diagnostic Trouble Code Discussion for May 2007

Exhaust Gas Recirculation System Flow Malfunction

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Trouble Ticket Help Requests for DTC P0400
Help Request Posted
1998 Mercedes-Benz C230 2.3L Misfire, MIL Lamp on VIN: WDBHA23G1W
P0400: EGR flow. Dear Group , Please consider my latest affliction , I have read the fix archives about the MAF sensor problems common to this car . Usually with a P0170 fuel trim code this car does not have.This car has a horrific misfire and will barely pull out of its own t...
May 02, 2007
2000 Mazda 626 LX 2.5L MIL Lamp on VIN: 1YVGF2209Y
P0400: EGR System Flow Malfunction. ... with same code. Although the boost solenoid is working fine. My Alldata only has a flow chart that basically checks the boost solenoid for P0400. I found a test for the boost SENSOR. It seems to indicate a problem with the sensor. But, I'm not 100%. At $28...
May 08, 2007
1998 Mercedes-Benz ML320 3.2L No Start VIN: 4JGAB54E1W
P0400: egr malfunction operation cycle. Need some help from all you mercedes techs. This ml320 came in for an intermitent no start. Happened to the customer about three times. The engine cranks over but vehichle will not start after 15 or so times the car starts up fine. Almost like the fuel is shut...
May 08, 2007