Try:
http://www.type2.com/m-codes/t2mcodes.html
http://www.in2vws.com/index.php?option=com_content&task=view&id=15&Itemid=45
http://www.thesamba.com/vw/archives/info/mcodest2.php
http://www.chrisandrose.co.uk/mcode.html

Jim

----- Original Message -----
From: "Paul Guzyk" <paullist08@GUZYK.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, May 08, 2009 7:35 AM
Subject: Friday fun, decode your Vanagon factory M codes

On your white paper build sticker (usually under the dash near the fusebox
or on top of the engine bay) you may see some of these codes, along with
your paint details and VIN.

I found this list on the Karmann Gipsy UK group member website
http://karmann-coachbuilts.com/   If anyone has a better list pls post a
link to it.