I think you have to clear codes twice, until you get the single flash, if I recall. Do a search for my user name in this forum - I had a problem when my battery died and the guys here really helped out. In one of the posts, all the codes were listed.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport