The thing that the Bentley charts do not take into account is the varied code definitions from chassis to chassis. You may be looking at a 3 series manual, but it does not break down the individual tables within the Peake manual which correspond to specific cars. For example, my 323 uses one chart of specific codes, where as your 330 would use another. The codes within are different for each table.
The Bentley table does the best it can, and serves a purpose. But there is a reason techs, dealers, and the factory do not rely on OBDII and a translation chart for doing actual diagnostic and repair work.
Also, because the chart does not work in reverse (because it's not really necessary to), you won't see the BMW factory codes that are not represented at all by OBDII.
Peake tools have actually been endorsed by and included in Bentley manuals since 1992. Clearly, they don't feel it is a redundant tool, even though they publish this chart for those who opt to use a generic tool.
Last edited by ken@bimmertools; 01-14-2010 at 11:20 PM.