I've got a similar problem with my 190e. The left headlamp does not work on low beam, but works when I pull on the high beam forward. The right lamp does not work on high beam when pulled forward, and goes out totally when I turn on the high beams.

Any ideas on where to start?

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Chris
93 190e 2.6 147k
81 240D 265k
89 Range Rover 165k