Thread: DEF Usage?
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Old 08-31-2012, 08:20 PM
boooomer boooomer is offline
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Location: Boynton Beach Fl.
Join Date: Apr 2010
Posts: 142
Mein Auto: 'BMW 335d, Audi A3
Originally Posted by BB_cuda View Post
Idea: A)Buy one of those devices made to pump oil out of your crank case through the dip stick tube
B) suck out all of fluid on active side
C) fill up passive side

Start her up and see if DEF light comes on. You might have to be pateinet and give the system a little bit correction time. If DEF light stays on, wouldn't this be grounds for transfer pump indictment?

does the light come on from a active side or passive side sensor?
Interesting point... is there a different warning for the two tanks - active vs passive? I couldn't tell in the tech literature I've read. I know they both have level sensors - but it wasn't clear how they work.
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