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Ml 400 CDi oscillating idle

8K views 1 reply 2 participants last post by  mattml430 
#1 ·
Hi,

I have a Ml with a om628 engine and the idle is oscillating between 600 - 850, usually when I start it up when tha engine is hot. It really rarely hapens when the engine is cold.

I have access to star and only engine related code I get is:

P2027-128 Check component Y100/1 (Right charge pressure positioner). Positioner signals fault (message through ground keying).

And this comes a week later when I clear the codes.

I checked the realtime values with star from both positioners and mafs. The positioners were same 70%, in mafs there were slight difference. I am suspecting the right maf but since they are over 200 € / piece I dont want to buy them if the fault is somewhere else.

Other components I should check?
 
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