How to tell if DEF (adblue) tank is full

Discussion in '2012-2016 VW Passat TDI forum' started by domano 68, Apr 12, 2012.

  1. domano 68

    domano 68 Member

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    So when I pick up my Passat and the dealer tells me the DEF tank is full how do I tell?
     
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  2. chittychittybangbang

    chittychittybangbang Administrator

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    There is no dipstick. You just have to add until no more fluid goes in. Also, Adblue is included for 3/36k. There might be a measuring block through VCDS software that can see this through a sensor but there's no gauge or anything like that.
     
  3. wolfsburg_de

    wolfsburg_de New Member

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    With VCDS, I believe you can find the level (expressed as a percentage) in Engine -> Advanced Measuring Values -> 98-0:Sensor for reducing agent fill level. My Passat with about 3600 miles, mostly around town, shows a fill level of 77.03 %.
     
  4. domano 68

    domano 68 Member

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    Thanks for posting! This is my first VW so I have no idea what VCDS is. Thanks!
     
  5. MyAvocation

    MyAvocation Member

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  6. domano 68

    domano 68 Member

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    Oh, ok. Thanks.

    I haven't looked at the DEF tank yet but does it have a long neck, i.e. > 10" or so? If not, I imagine you could put a clean stick in there and see where it comes back. Your own personal dipstick.
     
  7. Naphta

    Naphta New Member

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    Ad blue

    I think that there is a light that will come on in the dash when the level is low reminding you to refill.
     
  8. rico567

    rico567 Member

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    And in a Mercedes AdBlue car, if you ignore the warning and the AdBlue runs out, you have something like 20 starts, and then your ride goes dead until a refill/reset is done.
     
  9. TDI_Brad

    TDI_Brad Member

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    I read a post on vortex about a B7 that wouldn't start turns out he was out of adblue. So that is confirmed for us.
     
  10. domano 68

    domano 68 Member

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    I guess one could make their own dipstick and monitor the level. Does this have a long neck going down into the tank or a relatively short neck?
     
  11. FirstTDIinMS

    FirstTDIinMS New Member

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    Haven't found anything about how to check the level but it gives you about 1,500 miles warning before it won't start again. My 2012 SEL has 20K on it now and adblue warning came on at about 15,500 miles.
     
  12. 02r1guy

    02r1guy New Member

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    I paid to have my 40k and 50k service done with a package. Adblue was topped off at 40k and I just had my 50k done. Just checked and 39.79% with VCDS :(

    So I used the MB 2.5 Gal with new hose I bought some time ago. Nothing spilled and I kept refreshing the reading with VCDS and got it to 100%. Not sure how accurate it
    is, but I have no problem topping off since service is going to be done by me going forward (did 30k too) and Adblue consumption could go up with the "fix" anyway :)
     
  13. lwt42

    lwt42 Well-Known Member

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  14. lwt42

    lwt42 Well-Known Member

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  15. TDINorth

    TDINorth Member

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    I bought the 1/2 gallon VW jug of AdBlue, used it, then cut the safety lock off the bottle, refill it with Walmart DEF and refill the tank when needed. It also works on my Audi Q5 TDI. And it fits the opening where no spillage occurs when the tank is full.
     
  16. Keithuk

    Keithuk Super Moderator

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  17. 2ndPassat

    2ndPassat Member

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    At least in my case, you can tell the DEF tank is full by noticing DEF fluid spilled around the tank by a sloppy VW mechanic. You can use an AdBlue Audi/VW DEF fluid bottle to fill the tank. If you don't have one, they run about $15 from an Audi/VW dealer. It's a bottle that holds 1/2 gallon of fluid. It threads onto the tank without spilling... then you push it down to release the valve... it flows in. Some people use it with a hole cut in the bottom to act as a funnel/measure to dispense DEF in half gallons at a time. I've kept an empty bottle in my trunk just in case the fluid indicator came on... to add a few gallons until the next service... where the mechanic spills DEF fluid all over again. :-( It's sized just enough to fit above your spare tire, there's plenty of room. It's sort of like the spare tire... you hope you'll never need it, but it good to have it along.
    Photo on 12-3-16 at 5.48 AM.jpg
     
  18. rico567

    rico567 Member

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    Having had our Passat for 3 1/2 years at at around 53K miles, it's pretty easy to estimate that a standard jug of DEF *(2.5 gal US) available in finer stores everywhere (I get mine cheapest at Rural King for $6.99) will refill the tank at the same time I do the engine oil & filter change at 10K. (The car's tank holds around 5 gal, so no danger of running out using this system.) I found the Mercedes fill hose & jug on sale and bought that, just funnel the 2.5 gal. of def into the 10L Mercedes jug, hook up the hose (which is vented), and let it flow in. No mess, no fuss. As has been noted, it's impossible to run out and drive the car, it will warn you starting at 1200 miles, then count down, and if it gets to zero and you stop the car, you won't get a restart. (Don't do this!)

    *For those new to this, the term "AdBlue" is a proprietary term of one of the manufacturers, M-B, I believe. The generic term is DEF (Diesel Exhaust Fluid), and DEF is DEF, no matter where you buy it, it's just urea, think of it as a supersaturated solution of pee.
     
  19. JeffsGolfTDI

    JeffsGolfTDI New Member

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    Stealership told me that DEF from anywhere else will void warranty?
     

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