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Old 05-18-2018, 01:46 AM   #11
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Default Re: No DEF warning light

Quote:
Originally Posted by Mike DZ View Post
If you are running without DEF, you are polluting more than the vehicle is supposed to. The engine is not affected. There will be more NOx coming out of your tailpipe.

However, MB has worked very hard, at the direction the EPA, to make it impossible to run far without DEF.

Perhaps you should fill your own DEF tank and see how much it takes.
Thanks Mike. I would assume I might fail inspection then but Iím glad the engine is safe at least.
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Old 05-18-2018, 02:20 AM   #12
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Default Re: No DEF warning light

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Originally Posted by WanderOften View Post
Thanks Mike. I would assume I might fail inspection then but Iím glad the engine is safe at least.
Unless you bought it used and it was modified some fashion, I believe you have the large tank and just havenít hit the warning yet. 3k highway miles per gallon is not out of the realm of possibility.
Why donít you just fill the tank pro-actively instead of risking problems?
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Old 05-18-2018, 04:23 AM   #13
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Default Re: No DEF warning light

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Originally Posted by Sdavis View Post
Is there a video posted somewhere that demonstrates the process of topping off the DEF?
Sure, you tube has a number of them, some use a funnel, others use the plastic hose that comes with the 2.5 gallon box, others use the 1/2 gallon ADBlue special bottle, and still others use the DEF pumps at the big boy diesel pumps at a truck stop. In all cases you have to locate your DEF fill (blue or black cap with the letters DEF on it) unscrew and insert your fill device of choice (note above), fill until full, bump the vehicle to burp and fill again. NOTE: Flush any over flow or spill immediately with plain water, DEF will dry to a white crust and is corrosive as it is a urea solution.
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Old 05-18-2018, 07:09 AM   #14
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Default Re: No DEF warning light

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Originally Posted by Sdavis View Post
Is there a video posted somewhere that demonstrates the process of topping off the DEF?
I purchased two of these 1/2 gallon bottles and refil them from larger 2-1/2 gallon cantainers. I found it cumbersome and difficult to hoist a 20-pound box, while manipulating a Water Wiggle spout without spillage. I am reluctant to buy DEF at pump because of contamination concerns.

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Old 05-18-2018, 11:50 PM   #15
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Default Re: No DEF warning light

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Originally Posted by rollerbearing View Post
Your cab chassis may have the large DEF tank which I recall is around 5.8 Gallons. It's possible you just haven't run it down yet, but you will pretty soon. Consensus thinking is pretty much to keep it topped off.

I'm not remembering with great accuracy but I have added maybe 7.5 gallons over the course of 18,000 miles and the dealer did a partial fill in there as well.
Winner, winner chicken dinner! As luck would have it the low DEF light went on today coincidentally so it looks like you were right. Thanks for the help.
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Old 05-24-2018, 10:31 AM   #16
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Default No DEF warning light

Sprinter owners manual has details about DEF.

My 2013 manual says ďFor
this reason, refill the DEF tank regularly
during vehicle operation, or, at the latest,
after the first warning message has been
received from the on-board computer.Ē

The manual also says ďIf the DEF supply drops below
1.5 US gal (5.5 l), you receive the first warning
message and you hear a warning tone. After
the first message appears, the remaining DEF
supply suffices for approximately 1000 miles
(1600 km) in normal driving conditions.
Then, the reserve range of 0.8 US gal (3.0 l)
is reached. Once the reserve range has been
reached, you receive the next warning
message and you hear a series of warning
tones. After the first message appears, the
DEF reserve suffices for approximately
1200 miles (1900 km). You can, however,
only start the engine another 16 times.Ē

Last edited by Knit; 05-24-2018 at 10:34 AM.
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Old 05-24-2018, 01:04 PM   #17
avanti
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Default Re: No DEF warning light

Quote:
Originally Posted by Knit View Post
Sprinter owners manual has details about DEF.

My 2013 manual says “For
this reason, refill the DEF tank regularly
during vehicle operation, or, at the latest,
after the first warning message has been
received from the on-board computer.”

The manual also says “If the DEF supply drops below
1.5 US gal (5.5 l), you receive the first warning
message and you hear a warning tone. After
the first message appears, the remaining DEF
supply suffices for approximately 1000 miles
(1600 km) in normal driving conditions.
Then, the reserve range of 0.8 US gal (3.0 l)
is reached. Once the reserve range has been
reached, you receive the next warning
message and you hear a series of warning
tones. After the first message appears, the
DEF reserve suffices for approximately
1200 miles (1900 km). You can, however,
only start the engine another 16 times.
It does say that (in the "Introduction" section), but the last sentence incorrect -- I assume a translation garble. It is not true that you get the "16 starts" after the "first message" as stated.

The correct behavior is described on page 178 (and several other places):

If the supply of DEF is less than 1.5 US gal (5.5 l), the Check Diesel Exhaust Fluid See Operator's Manual message is shown in the display.
If the supply of DEF falls below the reserve range of 0.8 US gal (3.0 l), the xx starts remaining message is displayed. In the display, xx corresponds to the number of possible remaining engine starts (16 to 0).


This omits the erroneous "16 starts after first message" statement.

Also, N.B., that you don't actually always get 16 starts. I have only seen 10, and others have reported the same.
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