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AdBlue warning light/reset fault W166

Discussion in 'General Mercedes-Benz Related Discussion' started by Adio25, Apr 14, 2018.

  1. Adio25

    Adio25 New Member

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    Joined:
    Apr 14, 2018
    Your Mercedes:
    ML250 AMG Bluetec/2014/2.1
    Hi All,

    My first post here so please bear with me. Purchased a 2014 ML250 Bluetec recently.

    The check AdBlue warning and engine light came on and I filled tank up with 12 litres of AdBlue. Have driven car over 300miles and lights are still appearing. Have 100 miles remaining on count down.

    Scanned car using MBII and get two fault codes:

    P13e400
    P2badfb

    Both in relation to AdBlue/def system from my searches on google.
    Does anyone know exactly what components fault codes are referring to?

    Tried deleting fault codes but they just reappear again.

    Have been in contact with Mercedes who have said they don’t know what the above fault codes are and that I probably need a nox sensor replacing but want £90 to do their own diagnostics before anything else.

    AdBlue refill was previously completed by Mercedes May 2017 and since then car has covered 5k miles only. So I wouldn’t have expected it to require topping up already.

    Any advice is welcomed
     
  2. Headhurts

    Headhurts Senior Member

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    Joined:
    Jul 24, 2014
    Location:
    Norwich, Norfolk
    Your Mercedes:
    E350 Night Edition Estate/2016/Diesel
  3. OP
    Adio25

    Adio25 New Member

    Messages:
    4
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    Joined:
    Apr 14, 2018
    Your Mercedes:
    ML250 AMG Bluetec/2014/2.1
    Thanks.

    Checked the AdBlue full level in the service menu and it states full. So it’s not the AdBlue tank sensor.
     
  4. Oarsman

    Oarsman Senior Member

    Messages:
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    Joined:
    Mar 16, 2010
    Location:
    Norfolk
    Your Mercedes:
    W221 S350L CDI Bluetec & Range Rover Vogue SE 4.4 TDI
    I had this happen on my W221 and had to have the Adblue heater and pump replaced. Fortunately for me, it was under warrantee.
     
  5. OP
    Adio25

    Adio25 New Member

    Messages:
    4
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    Joined:
    Apr 14, 2018
    Your Mercedes:
    ML250 AMG Bluetec/2014/2.1
    Found the generic coding in relation to my codes:
    P2BAD (AdBlue/DEF system and listed many different causes) and P13E4(Cylinder 5, sensor)
     
  6. Headhurts

    Headhurts Senior Member

    Messages:
    767
    Likes Received:
    172
    Joined:
    Jul 24, 2014
    Location:
    Norwich, Norfolk
    Your Mercedes:
    E350 Night Edition Estate/2016/Diesel
    Mine had a full tank of AdBlue but the sensor had to be told it was full before it could calibrate what remains if that makes sense?

    Robin
     
  7. OP
    Adio25

    Adio25 New Member

    Messages:
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    Joined:
    Apr 14, 2018
    Your Mercedes:
    ML250 AMG Bluetec/2014/2.1
    Both Nox sensors at fault and replaced by Mercedes under warranty.
     
    BillyBoy likes this.
  8. jp williams

    jp williams Senior Member

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    Joined:
    Apr 19, 2006
    Location:
    Wirral & Axarqia,Spain
    Your Mercedes:
    2002 E class 2.2 cdi auto estate, Lexus GS 450h
    A good result.Well done.
     
  9. Benton

    Benton Member

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    Joined:
    Aug 9, 2017
    Location:
    Cedar Park TX
    Your Mercedes:
    2005 E320 CDI
    Has anyone ever done the Adblue bypass. I'm having issues with the Adblue. It has been topped off, but I'm still receiving the notification to check the system at start up, and the check engine light is on, and I have a limited amount of starts left. I scanned and got codes suggesting the heating element, but that is gone now, and I don't read any code faults, yet the check engine light remains on. The cost of the bypass is way less than replacing components, and i am exempt from emissions where I live, so...would like to learn more about the bypass if anyone can help?
     

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