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Old 09-23-2011, 02:20 AM   #1 (permalink)
BenzWorld Junior Member
 
Date registered: Feb 2009
Vehicle: 2000 ML430, 2002 E320
Location: Delray Beach Fl
Posts: 35
Check engine codes P400 and P410

Have had persistant check engine code P0400 for several years however car had been running fine. Yesterday I returned from a trip where I had left the car parked for 3 weeks and the engine ran very rough at low speed. Made it home (50 miles on interstate) but still runs rough. Error codes are
P0410 Secondary air
Po400 Air recirculation
P0300 Random misfire
P0306 Cyliner 6 misfire

Can the secondary airpump failure cause this rough idle problem?
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Old 09-23-2011, 03:34 AM   #2 (permalink)
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Date registered: Apr 2009
Vehicle: 96 E-320, 91 190E, various and sundry Euro and American vehicles
Location: N/W Chicago in the cornfields
Posts: 12,141
A cylinder misfire sure can.
I would look at the coil supplying cyl 6. I've replaced 2 of the 3 coils thus far.
Your setup differs from mine in that it is a V-6 rather than inline, but the coil packs on mine have been trouble.

Oh, and on the P0400 . I get it at random, and clear the code. It goes away for a week to several months. I've cleaned and replaced all lines and the egr is not sticky.
I live with it like you have.

Last edited by aardvark; 09-23-2011 at 03:40 AM.
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