400 isnt a code.. codes usually look like this:
Service Code 65100914A5 indicates a radio malfunction
Service Code 6313051200 indicates turn signal problems
Service Code 6312221200 indicates low-beam failure
Service Code 85990092MP indicates a level 1 inspection
Service Code 61610077MP indicates replacement wiper inserts
Service Code 6134001000 indicates the lighter kept falling out
Service Code 34117777MP indicates replacement front brake pads
please check again and repost
matter of fact here is a link to the list of codes for BMW:
http://www.bimmerfest.com/forums/attachment.php?s=7a84f8216a1f58230c693aa6194cd10d&attachmentid=72464&d=1144251401
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