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P0400 Diagnostic Trouble Code Discussion for March 2006

Exhaust Gas Recirculation System Flow Malfunction

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Trouble Ticket Help Requests for DTC P0400
Help Request Posted
1997 Mazda Miata 1.8L MIL Lamp on VIN: JM1NA3531V
P0400: EGR System Flow Malfunction. ... gray hair. Vehicle was in 2 months ago with P0400 stored, customer stated C.E.L. had been illuminated for almost a year. EGR vacuum solenoid not functional. Replaced vacuum and vent solenoid. Engine will stall with vacuum applied to EGR valve. DTC returned...
March 09, 2006
1996 Nissan Sentra 1.6L MIL Lamp on VIN: 1W4AB41DXT
P0400: EGR System Recirculation Flow. I have already replaced the egr soleniod and all the vacuum hoses. The egr and back pressure transducer work. The problem is the ported vacuum to the sol. is weak. I have maybe 5 in. reving the engine. The hose is new the port is clean and open. What should po...
March 16, 2006
1995 Nissan Altima GLE 2.4L Excessive Emissions VIN: 1N4BU31D5S
P0400: EGR system fault. Hi, This vehicle came in for MIL being on and failing smog check at a test only station. Failed HC, NOx, and functional for MIL being on. Repaired MIL by cleaning out clogged exhaust passages leading up to transducer. Pre-tested vehicle. Everything ok except i...
March 24, 2006
1999 Mazda 626 ES 2.5L MIL Lamp on VIN: 1YVGF22D8X
P0400: EGR System Flow Malfunction. this car has been illuminating the mil intermittently. 1st time it was here i searched the forum archives and decided to clean the passeges and the egr. i removed the throttle body and the egr to clen and i saw no blockages. i sprayed it really good and did a ...
March 30, 2006