Car Problem Reports

Mercedes-Benz S420 Emissions-related ports in cylinder head may clog

 
Mercedes-Benz S420 Problem
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Model Years Affected: 1994, 1995, 1996, 1997, 1998, 1999

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Ports in the cylinder head related to the emissions air injection and EGR systems can clog; the cylinder head should be removed and the ports cleaned.

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