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missing problem

chez

New Member
Joined
Mar 29, 2008
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4
:confused: hi to all on the site im a new member.i have a problem with my a140 y reg it not running right it seems to be missing ive changed the plugs and tried a new ignition coil but its still not running right i just wondered if anybody had any ideas before i take it to the garage. thanks to all that reply.
 
Air mass sensor I suspect.

Take it to a specialist and they should be able to diagnose it.
 
air mass sensor is part of the engine control unit and very costly .
however there are specialists that will repair just the air mass for a fraction of the cost .
mercedes will only sell you a new complete monolith / control unit which will only be able to be coded in with a star machine via mercedes
 
thanks to both replys

hi thanks for all your help i took the air mass sensor put and cleaned it with electrical cleaner and left it to dry replaced it and it now runs fine thanks for all your help. chez
 
It will not work forever after you have cleaned it. Some a coulple of weeks, some a couple of months.
 
ho well

thanks black c55 the reason i cleaned it was i took it into national tires for a service and i think when he had a look at the air filter [ didnt change it ] he put it back wrong he didnt put the holder across to hold it in place it was just rolling around i think he didnt change the plugs as well because when i took them out they where black after only 200 miles.anyway at the moment it runs fine im hoping the problem is solved because i know the airmass sensor are expensive its in for m.o.t this friday i hope nothing else goes wrong. thank for all your help chez.
 
Air mass sensor for A class is well over £1000 + coding charges
 

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