So just checking in. The changeover valve fixed our code. We've been prepping the car for sale. "De-kidding" it and the like. I think CsnBs is the definitely the way to go for these diesels. 2 of them just ran through and aren't as well optioned as ours, with higher mileage, not as well maintained, and went for $14.5k and $17.5k. We're hoping ours will bring $15k but am more optimistic about higher given those results.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)