Great thread folks.My 2011 X5d went 10244 miles before first service and required no DEF
My driving habits have not changed.
At ~17K, my low DEF light went on. My service advisor said to add a small bottle (1/2gal) and that should carry me over till service. I was skeptical but said OK and it was pretty cheap. Now at 18100, my light goes back on???
1. Was I underfilled? Service report at 10244 says I took 1 unit.
2. Transfer pump issue? I suspect #1 is real issue
2. Please explain active v. passive tanks. I see the filler in my X5d on right side and have added fluid there. Where is other filler port?
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