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AdBlue warning light/reset fault W166

Discussion in 'General Mercedes-Benz Related Discussion' started by Adio25, Apr 14, 2018 at 10:04 PM.

  1. Adio25

    Adio25 New Member

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    Joined:
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    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

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    Joined:
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    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

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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

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    Joined:
    Saturday
    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:
    662
    Likes Received:
    118
    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
     

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