with an LED code tester...you can build your own:

http://members.aol.com/ajdalton7/ledtool.jpg
also check out this thread: http://www.peachparts.com/shopforum/showthread.php?t=107630

or buy one from me...see my ebay link

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE