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#1
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What is an EGR Flow Malfunction?
Got my CE light checked and following code came up on the screen:
P0400 - EGR Flow Malfunction I cleared the light but am worried it could be something serious so if any of you know then I'd like to thank you ahead of time for your help.
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2004 CLK500 2000 S500 |
#2
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You most likely have a plugged EGR tube
Do a search on "egr tube" Common on that engine |
#3
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if this is on your 96 e320 with the m104 engine you'll find this thread interesting:
94 e320 EGR tube cleaning How many hours to do? i had a heckuva time getting the thing out and eventually gave up and just cleaned the dirty/plugged side. Problem free since june (4k miles)
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Daily Driver: 02 E430 4MATIC In the family: '03 E500 // '04 ML500 // 64 220SE |
#4
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EGR flow malfunction means; if the EGR is turned on then the extra fuel/air that comes into the engine SHOULD change the mixture & that changes the intake manifold vacuum! THAT vacuum change is monitored by a MAP sensor, IF the MAP sensor doesn't report the correct change durning that test then after only failed test the check engine lamp will come on the next time the engine is started!
The upper part of the intake must come off to replace that EGR tube! That is a 2-2.5hr job for expert MB technician, would allow 3-4 hrs for DIYer. Required parts should run $150.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#5
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Quote:
In hind sight I should have just taken the upper intake off instead of screwing around with the damn tube for 3 hours.
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Daily Driver: 02 E430 4MATIC In the family: '03 E500 // '04 ML500 // 64 220SE |
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