Engine light. Bad quality def. OTR HELP!

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Xenergiserx, Apr 20, 2021.

  1. Xenergiserx

    Xenergiserx Bobtail Member

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    I put 5 gallons of bad DEF! TANK IS HALFWAY FULL. Does def had a drain plug? Should I fill it up with good Def? I need to fix before engine derates. Thanks in advance
     
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  3. Arctic_fox

    Arctic_fox Medium Load Member

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    You got three choices. Buy a 5 gallon bucket someplace and use a siphon (most pilots have them in my experince) to get most of it out then backfill with jugged def to the brim.

    Or you can add bottled def to try and dilute the bad def.

    Lastly you can pay a shop.

    Otherwise you get into more complicated fixes
     
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  4. Xenergiserx

    Xenergiserx Bobtail Member

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    Well I drain the tank and filled up with good def. 10 miles in and I’m still getting low quality def. Engine derate 25% . Maybe I need to run it a lil more?
     
  5. Arctic_fox

    Arctic_fox Medium Load Member

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    I would run it to the next place that has a shop then have them code clear it if it doesnt go away on its own, some engine get persnickity about emissions stuff and a code clear will solve it. If the code comes back though it may be a diffrent issue, like a failing sensor.
     
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  6. bad-luck

    bad-luck Road Train Member

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    Sounds like you need to keep running it until the bad def is out of the system. I would continue to top it off with good def as well.
     
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  7. Xenergiserx

    Xenergiserx Bobtail Member

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    Thanks brother! Yes lights went off . I bought 2.5 gallons of that platinum def. 27 bucks. Then 60 dollars worth of def. I’m thinking of getting a big eraser and do me a D.
     
  8. bad-luck

    bad-luck Road Train Member

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    Your very welcome! Glad it worked out ok
     
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