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I guess it depends on the model. Looking at the 2019 5er Ordering Guide, i see 2VH as a standalone option for the 540, but the only place Integration Active Steering shows up for the M550 is part of ZDH, and it's coded as Z1A. There is no 2VH for the M550. Strange, but I guess that explains the VIN decoder differences.
Thanks for checking!
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