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post #1 of 8 Old 08-26-2012, 05:56 PM Thread Starter
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DEF question?

At 800 miles the warning came on and was counting down normally.Then it took a sudden drop to 249 miles to empty and now it's back up to around 300.Anyone else have this happen.

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post #2 of 8 Old 08-26-2012, 06:01 PM
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I don't really have an answer to your question but about how much does yours use def wise, mine has 5000 miles and took 4 gal. Does that sound right?

An idea though, maybe the def gauge is kinda like the instant mpg where it changes depending on how you drive?

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post #3 of 8 Old 08-26-2012, 06:25 PM Thread Starter
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I usually get around 5000 miles before the warning comes on.The last couple of months I have been hauling some heavy loads though and the warning came on sooner this time.

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post #4 of 8 Old 08-26-2012, 06:50 PM
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Yeah, our f450 does all the towing too so it prolly uses more than normal. Well free bump for ya!

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post #5 of 8 Old 08-27-2012, 06:16 AM
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Inever let mine get low enough to start the 800 mile count. I periodically check it and when it drops below 1/2 full, I add a 2.5 gals jug.

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post #6 of 8 Old 08-27-2012, 06:21 PM Thread Starter
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I put 5 gallon of DEF in this evening and it could have held a little more.Mileage was back down to about 250 miles to empty.

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post #7 of 8 Old 08-28-2012, 08:39 AM
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Go thru a few key cycles and drive the truck a few miles. If the message does not reset, get the software checked at your dealer.

Since you added 5 gallons, you were almost empty and should have gotten the message but it was weird how the countdown went?? I hope it resets itself for you.


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post #8 of 8 Old 08-28-2012, 05:32 PM Thread Starter
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It reset without any problems.

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