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AdBlue warning light/reset fault W166

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Adio25, Apr 14, 2018.

  1. Adio25

    Adio25 New Member

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

    Adio25 New Member

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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, 1963 Triumph TR4
    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:
    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

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    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

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    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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    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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    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?
     
  10. jjp35

    jjp35 Member

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    Hi Robin, How did you reset the sensor?

    I have similar problem

    On my 2012 ML250, I had Refill Ad Blue alert, filled tank with 20 litre Adblue then the " No Engine start XXX miles" sign came up. EML light is on.

    The Diagnosis with icarsoft MB V2.0 shows,

    Current Fault code P13E400 -Remaining Driving distance limited due to Malfunction in Adblue system"

    Any idea what this could be ?
     
  11. cataloyking

    cataloyking Senior Member

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    Location:
    n e scotland
    Your Mercedes:
    glc amg 4matic
     
  12. cataloyking

    cataloyking Senior Member

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    Location:
    n e scotland
    Your Mercedes:
    glc amg 4matic
    I had the same problem on my 220glc 2weeks ago mb said it was the ad blue injector was the problem I don't know what the cure was as I was away on holiday so waiting to get conformation on the problem I will post back when I here from them
     
    jjp35 likes this.
  13. jjp35

    jjp35 Member

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    Thanks, please let me know. It would be helpful.
     
  14. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    Location:
    Bristol/Somerset
    Your Mercedes:
    C220CDI AMG Line Premium, SLR McLaren Roadster, SL55 & C32AMG
    There are problems with Adblue heater elements across the range and plenty of TIPs documents on the subject too.

    Most of the time it just requires a software update to the SCR system.
     
    jjp35 likes this.
  15. dave@kent

    dave@kent New Registration

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    Jul 9, 2019
    Your Mercedes:
    ML W166
    Hi

    How can I check whether the current software installed on car needs updating or not?
    Does software update has to be done by MB dealer?
    Thanks
     
    Last edited: Jul 11, 2019 at 11:38 AM

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