I'm pretty sure it's the 1-axle EHC (I think the they call the 2-axle an EHC2, plus it's not as expensive for their quote)

So would this be something I should just get done at the dealer? They are charging $250 for the module. For the part and installation (and programming) it would be around $550.

The EHC module seems pretty easy to get to and replace? right?

http://www.justanswer.com/bmw/10dk3-...levelling.html