Vacuum leak problem?? P0173
I am getting error code P0173 and my dealer told me it might be a vacuum leak problem (haven't brought it in yet.) I am wondering what this is and if it is an easy fix. Does it have anything to do with the gas cap as I noticed that the bottom of the inside ring on my cap seemed wet when I removed it to fill up last week? I have a 2000 E430 4matic.
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