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    Posted by Andrew Ruellan on June 3, 2004, 6:04 am, in reply to "Mercedes ML270/2001/CDi/WDC1631132X740267- ERG Fault"

    Dear Simon,
    I have had poor engine response & irrelavant codes on merc CDI systems caused by air mass meters.You could scope for a patten but it looks normal but is under voltage.
    I have substituted a merc petrol AMM for testing and it always works well.(we have a spare).
    I think the Merc CDI AMM was only about £60 when I last bought one,because it has no housing.
    HTH Andrew Ruellan.

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