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Old 05-26-2016, 05:38 PM
TonyInUSA TonyInUSA is offline
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Location: USA
Join Date: May 2016
Posts: 6
Mein Auto: BMW 335d
DEF incorrect message

Recently I topped off my DEF tanks w/ the same fluid that I've used for the past couple of years (Blue-DEF bought thru Amazon). I drove my car for over 100 miles and then I got an error message saying, "Exhaust Fluid Incorrect". Also a "NO START in 200 mls" came up. I know I hadn't contaminated the jug, and it was fairly recently purchased. Anyone have a similar experience? I have a different brand that I have been using in my Silverado w/ a Duramax motor, so I'd like to swap out the "incorrect" DEF and refill. Do I have to siphon out the old, or is there a way to drain the tanks instead? Couldn't find this answer in previous threads, so thanks a bunch in advance.
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Old 05-26-2016, 05:54 PM
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Doug Huffman Doug Huffman is offline
Nuclear engineer
Location: Washington Island, Wisconsin, thru Death's Door
Join Date: Apr 2015
Posts: 3,155
Mein Auto: 2012 Feb 11 X5 35d (E70)
There are extraction fittings on the schematics, but I don't know if they are still implemented in the machinery.

The alarming parameter is a calculated value, so look to the sensors being wrong.
Post hoc ergo propter hoc is a weak logic akin to arguing from ignorance, "I don't know, but ..." Better to be silent and thought a fool than to babble and remove all doubt.
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Old 05-26-2016, 07:36 PM
KeithS KeithS is offline
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Location: Central NJ
Join Date: Dec 2001
Posts: 1,889
Mein Auto: '11 335d, '17 340iGT
All DEF is the same unless someone sold you bogus/fake stuff. It's cheap enough that it certainly would not make sense for some one to do so. When you fill the tanks I believe that triggers the DEF quality test. There may be a separate problem that already existed which got detected when you filled.
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Old 05-26-2016, 09:49 PM
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BB_cuda BB_cuda is offline
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Location: Clear Lake, Texas
Join Date: Nov 2011
Posts: 930
Mein Auto: 2011 335D Msport
Take off driver's side access panel under neath. There are some quick disconnects that you can drain from. Don't get it on you as it stinks.
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Old 05-26-2016, 10:01 PM
ingenieur ingenieur is offline
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Location: Horse country
Join Date: Dec 2006
Posts: 362
Mein Auto: 328d
"Incorrect DEF" message means a SCR system efficiency problem - most likely an aging NOx sensor(s) or DEF metering valve problem since you are using fresh DEF, although it could be suspect as you indicate. BMW ISTA has diagnostic test plans to check all of the components if it is not a DEF issue.

Last edited by ingenieur; 05-26-2016 at 10:03 PM.
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Old 05-26-2016, 10:07 PM
montr montr is offline
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Location: Atlanta
Join Date: Oct 2006
Posts: 331
Mein Auto: 335d 2010
For the test about incorrect DEF, see ST810 pp. 30-31
See second document for draining DEF
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