Aha...I think you're onto something! Looking closer at the sockets,I can see where some part of them may have broken off. Thanks very much for the tip! Now to see if I can locate the part without crawling to a dealer. I just bought the H6W bulb online for about $3.00..... the dealer wanted $13.!!!! for the same part.

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2001 E320 4matic, 2003 E320 4matic wagon