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P0400 Diagnostic Trouble Code Discussion for August 2009

Exhaust Gas Recirculation System Flow Malfunction

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Trouble Ticket Help Requests for DTC P0400
Help Request Posted
1996 Mercedes-Benz C280 2.8L MIL Lamp on VIN: WDBHA28E6T
P0400: EGR flow. Thanks in advance for any help. I am not a MBZ tech but serviced this for a good customer. I did a minor service (lube, oil and filter), replaced bad front shocks, replaced bad fan clutch and thermostat. Everything was fine vehicle left after service and 1 da...
August 12, 2009
2000 Mazda 626 LX 2.5L MIL Lamp on VIN: 1YBGF22D9Y
P0400: EGR System Flow Malfunction. egr flow problem, everything i can think of has been replaced up to this point. see vehicle repair history.
August 24, 2009
1999 Chevrolet Metro 1.0L MIL Lamp on VIN: 2C1MR2260X
P0400: Egr system performance. Car came in with light on, Code po400. No drivability complaints. Tech 2 scanner showed computer is commanding valve properly(19 inches vacuum to valve, valve opens all the way) - Manually applying vacuum to valve the engine DOES stall out. Cleared code & ...
August 28, 2009